Updated July 27, 2026: Heat pump operating behaviour varies by equipment type, outdoor temperature, thermostat settings, building load and control strategy. Always follow the operating instructions for your specific system.
Heat pump running constantly? Long operating cycles can be completely normal, especially during cold weather, hot weather or when a variable-capacity heat pump is maintaining a steady indoor temperature. A heat pump does not need to shut off frequently to be working correctly.
Continuous operation becomes more concerning when the home cannot reach the thermostat setting, electricity use changes sharply, backup heat runs continuously, airflow becomes weak, the outdoor unit remains heavily iced, the system develops fault codes or the compressor appears to stay at maximum output without maintaining comfort.
Before assuming the heat pump is too small or failing, check thermostat settings, filters, airflow, outdoor-unit condition and whether the system is recovering from a large temperature change. Problems with ductwork, refrigerant charge, sensors, fans, backup heat or the building itself can all make a heat pump run longer than expected.
This guide explains why ducted, ductless, multi-zone, full-electric and dual-fuel heat pumps may run continuously and how BC homeowners can tell normal operation from a problem that needs service.
Is It Normal for a Heat Pump to Run Constantly?
Sometimes, yes.
Heat pumps are designed differently from traditional furnaces. A furnace may deliver a large amount of very hot air for a relatively short period, shut off and then restart when the home cools.
A heat pump often provides lower-temperature heat over longer periods.
Variable-capacity systems can reduce compressor and fan speed instead of shutting off completely. During mild conditions, the system may operate continuously at low output while using only part of its available capacity.
Continuous Operation Can Be Normal When:
- The indoor temperature remains at the setpoint
- The system is operating quietly at reduced capacity
- Outdoor temperatures are very cold or very hot
- The system is recovering after being turned off
- The thermostat setting was recently changed
- The heat pump is completing a defrost cycle
- A variable-speed system is modulating at low output
Continuous Operation Is More Concerning When:
- The home cannot reach the selected temperature
- The indoor temperature continues falling during heating
- The indoor temperature continues rising during cooling
- The system runs loudly at maximum capacity for hours
- Auxiliary heat remains on continuously
- The outdoor coil stays heavily iced
- Airflow becomes weak
- The system shows a fault code
- The breaker trips
- Energy use changes significantly without a weather explanation
Run time by itself is not enough to diagnose a problem. Comfort, capacity, airflow, equipment speed and outdoor conditions need to be considered together.
Heat Pump Running Constantly: Normal or a Problem?
| Observation | May Be Normal | May Need Inspection |
|---|---|---|
| System runs most of the day | Cold or hot weather, variable-speed operation | Home cannot maintain the thermostat setting |
| Outdoor unit runs continuously | Compressor is modulating at low capacity | Unit remains at high output and comfort declines |
| Indoor fan runs continuously | Fan setting or equipment strategy intentionally allows it | Fan never stops despite thermostat or control commands |
| Heat pump runs overnight | Outdoor temperature falls and heating load rises | Indoor temperature steadily decreases |
| Supply air feels warm, not hot | Normal heat-pump heating | Air remains cold and room temperature drops |
| Heat pump runs after thermostat change | Recovering from a temperature setback | Never reaches the new setpoint |
| Auxiliary heat appears occasionally | Cold conditions, defrost or recovery | Auxiliary heat stays on during mild weather |
| Heat pump pauses briefly | Normal control or defrost operation | Frequent faults interrupt operation |
What Should You Check First?
Before calling for repair, homeowners can safely check several basic items.
- Confirm the thermostat is in Heat or Cool mode.
- Check the selected temperature.
- Confirm the thermostat is not in an unusual schedule, Hold, Away or Vacation mode.
- Set the fan according to the manufacturer’s instructions, normally Auto unless continuous circulation is intentional.
- Inspect the central air filter.
- Clean ductless filters if visibly dirty.
- Open supply registers.
- Make sure return grilles are not blocked.
- Keep ductless indoor-unit airflow unobstructed.
- Check the outdoor unit for leaves, snow, vegetation or heavy ice.
- Record any displayed fault code.
- Compare indoor temperature with the thermostat setting.
Give the System Time to Respond
If you recently changed the thermostat several degrees, the heat pump may need a long operating period to bring the entire building back to temperature.
Walls, floors, furniture and other materials inside the home also store heat. Recovering the room air temperature is only part of the load.
Cause 1: Cold Outdoor Weather Increases Run Time
As outdoor temperature falls, the home loses heat faster.
At the same time, an air-source heat pump may provide less heating capacity than it does during milder weather.
This means the system naturally runs longer as winter conditions become colder.
Why Heating Load Increases
Heat escapes through:
- Exterior walls
- Windows
- Doors
- Ceilings
- Floors
- Air leakage
- Uninsulated ducts
The larger the indoor-to-outdoor temperature difference, the faster the building tends to lose heat.
Long Run Time Can Be Efficient
A correctly sized variable-capacity heat pump may run almost continuously during design winter conditions.
That does not automatically indicate a problem.
The system is doing its job when:
- The indoor temperature remains stable
- Backup heat use is reasonable for the design
- Airflow is normal
- No fault is present
- The outdoor unit clears frost normally
When Cold-Weather Run Time Becomes Concerning
Request diagnosis when:
- The home loses temperature faster than expected
- The system cannot reach the setpoint even in moderate weather
- Backup heat remains on continuously
- The heat pump repeatedly shuts down on faults
- The outdoor coil remains heavily iced
Cause 2: Variable-Speed Heat Pumps Are Designed to Run Longer
Many modern heat pumps use inverter-driven variable-capacity compressors.
Instead of operating only at full capacity and shutting off, they can reduce compressor speed when the building needs less heating or cooling.
A Variable Heat Pump May:
- Run for many hours
- Operate at lower compressor speed
- Use lower fan speed
- Maintain a more stable indoor temperature
- Reduce repeated starts and stops
- Adjust capacity as outdoor conditions change
Continuous low-capacity operation can provide better comfort than frequent cycling.
How Can You Tell Whether It Is Modulating?
Depending on the system, you may notice:
- Outdoor fan speed changing
- Indoor airflow changing gradually
- Quiet operation for long periods
- Very small temperature swings
- Power consumption varying rather than remaining fixed
Some communicating thermostats also display equipment stage or capacity.
Continuous Operation Is Not the Same as Full-Speed Operation
A heat pump running all day at 25 percent capacity is operating very differently from one running all day at maximum output.
This is why run time alone cannot be used to estimate efficiency or equipment condition.
Cause 3: Thermostat Settings Can Keep the Heat Pump Running
An incorrect or unrealistic thermostat setting can create continuous operation.
Check the Operating Mode
During winter, use Heat mode.
During summer, use Cool mode.
Automatic changeover may cause unexpected operation during unusual weather, solar gain or indoor heat generation.
Check the Fan Setting
The indoor fan may run continuously when the thermostat fan is set to On.
This does not necessarily mean the compressor is running.
Check whether the thermostat shows:
- Fan On
- Fan Auto
- Circulate
- Continuous ventilation
Some systems intentionally operate the fan for air circulation or ventilation even when the compressor is off.
Check the Setpoint
A very high winter setting or very low summer setting may keep the system operating continuously because the building load approaches or exceeds available capacity.
Check Thermostat Location
The thermostat may receive an inaccurate temperature if installed near:
- An exterior door
- A cold exterior wall
- Direct sunlight
- A fireplace
- A kitchen
- A supply register
- Electronic equipment
An incorrect temperature reading can cause unnecessary operation.
Cause 4: Large Temperature Setbacks Create Long Recovery Times
Heat pumps generally perform well when maintaining a relatively stable indoor temperature.
If the thermostat is reduced substantially overnight and raised several degrees in the morning, the heat pump must recover:
- Room air temperature
- Wall temperature
- Floor temperature
- Furniture temperature
- Other building materials
This can create hours of continuous operation.
Large Recovery Can Trigger Backup Heat
Some thermostats interpret a large temperature difference as a need for additional heating.
This may activate:
- Electric auxiliary heat
- A gas furnace in a dual-fuel system
- Higher compressor capacity
Use Smaller Changes
A relatively steady setpoint is usually easier for the heat pump to maintain.
ENERGY STAR recommends maintaining a steady temperature rather than using large setbacks with heat pumps.
Cause 5: Dirty or Restrictive Air Filter
A dirty filter reduces airflow across the indoor coil.
The system may run longer because it cannot transfer heat efficiently into or out of the home.
Possible Symptoms
- Weak register airflow
- Long run times
- Airflow noise
- Indoor coil freezing during cooling
- High blower speed
- Reduced heating capacity
- Higher energy use
Check Filters Regularly
ENERGY STAR recommends checking filters regularly and cleaning or replacing them when dirty.
Filter frequency depends on:
- Filter type
- Pets
- Dust levels
- Renovation work
- Operating hours
- Indoor air-quality conditions
A Higher-Rated Filter Is Not Automatically Better
A more restrictive filter may increase pressure drop.
The filter should provide the desired filtration without reducing airflow below the equipment requirements.
Cause 6: Low Indoor Airflow
A clean filter does not guarantee proper airflow.
Central System Problems May Include:
- Undersized return duct
- Blocked return grille
- Closed supply registers
- Crushed flexible duct
- Closed balancing damper
- Dirty indoor coil
- Dirty blower wheel
- Incorrect blower setting
- Failed blower motor
- High duct static pressure
Ductless Problems May Include:
- Dirty blower wheel
- Dirty indoor coil
- Blocked intake
- Furniture under the indoor unit
- Curtains blocking airflow
- Indoor fan problem
Why Low Airflow Extends Run Time
The heat pump may be producing heating or cooling capacity but cannot deliver it efficiently to the home.
A technician can measure:
- Total external static pressure
- Filter pressure drop
- Indoor coil pressure drop
- Fan speed
- Supply and return temperature
- Delivered airflow
Cause 7: Dirty or Blocked Outdoor Unit
The outdoor coil needs free airflow.
In heating mode it collects heat from outdoor air. In cooling mode it rejects heat outdoors.
Restrictions may include:
- Leaves
- Snow
- Vegetation
- Grass clippings
- Fence panels
- Stored items
- Tree debris
- Construction dust
- Heavy coil contamination
A restricted outdoor coil may cause:
- Longer run times
- Reduced capacity
- More frequent defrost
- Higher compressor load
- Fault codes
Homeowner Check
Keep the surrounding area clear without opening the equipment cabinet.
Do not use a pressure washer or sharp tool on the outdoor coil.
Cause 8: Frequent Defrost Cycles Reduce Heating Time
During winter heating, moisture can freeze on the outdoor coil.
The heat pump periodically enters defrost to remove the frost.
During defrost:
- The outdoor fan may stop
- The system may temporarily stop delivering normal heating
- Steam may appear
- Backup heat may operate
- Water drains from the outdoor unit
Frequent Defrost Can Increase Overall Run Time
The system has to replace heat lost during defrost and continue heating the building afterward.
Frequent or ineffective defrost may be caused by:
- Dirty outdoor coil
- Outdoor fan problem
- Sensor problem
- Control-board problem
- Refrigerant problem
- Poor drainage
- Heavy moisture exposure
NRCan notes that unnecessary defrost cycles reduce seasonal performance, which is one reason modern demand-defrost controls monitor system conditions before initiating the cycle.
Cause 9: Backup Heat Is Not Working Correctly
A heat pump can run constantly because the expected backup heating source is missing or incorrectly controlled.
Electric Auxiliary Heat
A central electric system may use resistance heat during:
- Very cold conditions
- Defrost
- Large thermostat recovery
- Periods when heat-pump capacity is below building load
If one or more auxiliary stages fail, the compressor may run continuously while the home remains below temperature.
Possible causes include:
- Tripped breaker
- Failed heating element
- Failed sequencer or relay
- Thermostat configuration
- Control-board problem
- Electrical wiring issue
Dual-Fuel Backup
A dual-fuel system may use a gas furnace below a selected outdoor temperature.
If the furnace does not take over when expected, possible causes include:
- Incorrect changeover temperature
- Failed outdoor sensor
- Thermostat configuration
- Furnace ignition fault
- Gas supply problem
- Shared-control problem
Cause 10: Low Refrigerant or Refrigeration-System Problem
A heat pump with insufficient refrigerant may continue running because it cannot transfer its expected amount of heat.
Possible Symptoms
- Reduced heating and cooling
- Long run times
- Ice on indoor or outdoor coils
- Fault codes
- Abnormal pipe temperatures
- Compressor overheating
- Oil residue near refrigerant connections
Refrigerant Does Not Normally Run Out
A sealed heat pump does not consume refrigerant during normal operation.
Low refrigerant can indicate:
- A leak
- Incorrect installation charge
- A previous incomplete repair
- A damaged component
Adding refrigerant without determining why the charge is low may provide only temporary improvement.
Cause 11: Fan or Blower Problem
Both indoor and outdoor airflow are essential.
Indoor Blower Problems
A weak or failing indoor blower may cause:
- Low airflow
- Longer run time
- Uneven room temperatures
- Coil temperature problems
- Equipment faults
Possible causes include:
- Dirty blower wheel
- Motor failure
- Incorrect speed
- Control problem
- High static pressure
Outdoor Fan Problems
A failed outdoor fan reduces heat transfer.
The compressor may continue operating until a protective control stops it.
Turn the system off when:
- The fan is striking ice
- The fan cannot turn
- There is grinding or severe vibration
- The breaker trips
Cause 12: Sensor, Thermostat or Control Problem
Modern heat pumps use multiple sensors and electronic controls to manage:
- Compressor speed
- Indoor fan speed
- Outdoor fan speed
- Defrost
- Backup heating
- Temperature control
- System protection
An inaccurate sensor can tell the system that more heating or cooling is required even when room conditions are close to the target.
Possible Symptoms
- System never satisfies the thermostat
- Displayed temperature does not match the room
- Compressor remains at unusually high output
- Backup heat operates at the wrong time
- Defrost happens too frequently
- System displays communication errors
Record fault codes before power is reset.
Cause 13: Duct Leakage or High Building Heat Loss
The heat pump may be working correctly while the building loses heating or cooling faster than expected.
Duct Problems
Conditioned air can be lost through:
- Disconnected ducts
- Leaking joints
- Uninsulated attic ducts
- Crawl-space duct leakage
- Damaged flexible duct
A system can run continuously trying to replace heat that never reaches the occupied rooms.
Building Heat-Loss Problems
High heating demand may result from:
- Limited attic insulation
- Air leakage
- Older windows
- Exterior-door gaps
- Open fireplace dampers
- Large glass areas
- High ceilings
- Uninsulated basement walls
Has Something Changed?
A heat pump that previously maintained temperature but now runs constantly may be reacting to a change such as:
- Duct damage
- Renovation work
- Open or disconnected ventilation
- Failed weatherstripping
- New thermostat settings
- Airflow restriction
- Equipment degradation
The building and mechanical system should be evaluated together.
Cause 14: The Heat Pump May Be Incorrectly Sized
A heat pump should be selected from the building’s heating and cooling loads and the equipment’s actual performance at relevant outdoor temperatures.
Undersized Heat Pump
An undersized system may:
- Run at maximum output for long periods
- Fail to reach the thermostat setting
- Use backup heat frequently
- Recover slowly
- Become increasingly inadequate as outdoor temperatures fall
NRCan notes that an undersized heat pump may require supplemental heating more frequently.
Oversized Heat Pump
An oversized system usually creates the opposite problem during mild conditions:
- Frequent cycling
- Temperature swings
- Poor summer humidity control
- Higher airflow noise
- Reduced seasonal efficiency
A variable-speed oversized system may still run for extended periods at minimum output, but severe oversizing can prevent stable modulation.
Do Not Judge Size From Tonnage Alone
The contractor should compare:
- Heating load
- Cooling load
- Low-temperature heating capacity
- Minimum compressor capacity
- Available duct airflow
- Backup heating strategy
A three-ton label does not guarantee that the system produces 36,000 BTU/h under every winter condition.
Heat Pump Running Constantly but Not Reaching the Thermostat Setting
This is different from normal continuous operation.
If the system runs without reaching the selected temperature, compare the indoor temperature with the setpoint.
One Degree Away
A small difference during extreme weather may reflect system capacity, thermostat averaging or control strategy.
Several Degrees Away
A larger and persistent difference is more concerning.
Possible causes include:
- Dirty filter
- Low airflow
- Dirty indoor or outdoor coil
- Refrigerant leak
- Defrost problem
- Failed auxiliary heat
- Furnace backup failure
- Fan problem
- Control fault
- Duct leakage
- Undersized equipment
- Unusually high building heat loss
Check Other Rooms
If the thermostat area is comfortable but one bedroom remains cold, the issue may be distribution rather than total heat-pump capacity.
Look for:
- Weak branch airflow
- Closed damper
- Missing return path
- Duct leakage
- High room heat loss
- Insufficient ductless coverage
Does a Heat Pump Running Constantly Use More Electricity?
Long run time does not automatically mean high electricity consumption.
A variable-capacity heat pump may run for many hours at low compressor speed and use less electricity than a system repeatedly operating at full capacity.
What Determines Electricity Use?
- Outdoor temperature
- Building heating and cooling load
- Compressor speed
- Equipment efficiency
- Auxiliary heat use
- Thermostat setting
- Duct and airflow condition
- Defrost frequency
- Home insulation and air leakage
Auxiliary Electric Heat Can Change the Bill Quickly
Electric resistance backup provides roughly one unit of heat for one unit of electrical energy.
A functioning heat pump transfers heat and can provide more heating energy than the electrical energy used by its compressor and fans.
Therefore, frequent resistance backup can substantially increase electricity consumption.
Compare Weather Before Comparing Bills
A higher winter bill does not prove the heat pump has failed.
Compare:
- Outdoor temperatures
- Billing-period length
- Thermostat settings
- Backup heat operation
- Other electrical loads
A diagnostic inspection becomes more useful when consumption rises significantly without a matching change in weather or household use.
Why Does My New Heat Pump Run More Than My Old Furnace?
This is one of the most common questions after a furnace-to-heat-pump conversion.
A gas furnace may supply air at a much higher temperature and operate in shorter cycles.
A heat pump typically provides lower-temperature air for longer periods.
Longer Operation Can Improve Comfort
A properly designed heat pump may provide:
- Smaller indoor temperature swings
- More continuous air circulation
- More even room temperatures
- Reduced start-stop noise
- Better summer humidity control
The Supply Air May Feel Different
Heat-pump air can feel warm rather than hot against your hand.
Judge the system by whether it maintains the room temperature, not by whether the supply register feels like a furnace.
New System Running Constantly and Not Keeping Up
That needs evaluation.
Possible installation issues include:
- Incorrect equipment size
- Wrong blower setup
- Restricted ductwork
- Incorrect refrigerant charge
- Control configuration
- Missing backup heat
- Incorrect furnace integration
Ductless Heat Pump Running Constantly
Ductless heat pumps frequently use inverter compressors and may operate for long periods at low output.
Normal Ductless Operation
The indoor fan may continue moving air while the compressor reduces output.
The room temperature should remain stable.
Check the Indoor Unit
Confirm:
- Heat or Cool mode is correct
- Setpoint is reasonable
- Filters are clean
- Indoor coil and blower are not visibly dirty
- Louvers are open
- Furniture is not blocking airflow
Check Multi-Zone Systems
Multiple indoor heads share outdoor capacity.
Continuous operation may occur when several zones call for heating or cooling at the same time.
The contractor should confirm:
- Indoor-unit combination
- Total connected capacity
- Outdoor-unit capacity
- Minimum capacity
- Low-temperature output
- Mode compatibility between zones
One Head Cannot Always Condition Several Closed Rooms
A ductless unit can run continuously because it is attempting to satisfy a thermostat in one zone while heat is being lost to adjacent spaces.
Closed bedrooms may need dedicated heating, supplemental heat or another distribution strategy.
Dual-Fuel Heat Pump Running Constantly
A dual-fuel system combines a heat pump with a gas furnace.
The heat pump may intentionally run through mild and moderately cold weather before the furnace takes over.
Check the Changeover Strategy
The control may use:
- Outdoor temperature
- Heat-pump capacity
- Thermostat demand
- Economic settings
- Manufacturer logic
Possible Problems
If the heat pump runs continuously and the furnace never starts even though the home is losing temperature, possible causes include:
- Incorrect balance-point setting
- Failed outdoor sensor
- Thermostat configuration
- Furnace ignition problem
- Gas supply problem
- Shared blower problem
- Communication fault
Do not adjust gas components or bypass furnace safety controls.
Should You Turn Off a Heat Pump That Runs Constantly?
Not simply because it has been running for a long time.
Continuous operation can be normal.
Leave the System Operating When:
- The home maintains temperature
- The equipment sounds normal
- No fault is displayed
- There is no electrical or water problem
- The outdoor unit is not heavily iced
Turn the System Off and Request Service When:
- There is a burning or electrical smell
- The breaker repeatedly trips
- The outdoor fan is striking ice
- The compressor makes severe grinding or impact sounds
- Water is reaching electrical equipment
- The system is heavily iced and cannot complete defrost
- Wiring appears damaged
What About Emergency Heat?
Emergency Heat may provide temporary heating when the outdoor heat pump cannot operate safely.
It is not intended as the normal solution for a heat pump that runs too long.
Electric Emergency Heat may use considerably more electricity than normal compressor heating.
What Should a Technician Check When a Heat Pump Runs Constantly?
A useful diagnosis should identify whether the system has a mechanical problem, distribution problem, control problem or simply a high building load.
The technician may check:
- Indoor and outdoor temperatures
- Thermostat setpoint and calibration
- Operating mode
- Equipment fault history
- Compressor speed or stage
- Indoor blower speed
- Outdoor fan operation
- Filter condition
- Indoor and outdoor coil condition
- Supply and return temperatures
- Total external static pressure
- Delivered airflow
- Refrigerant pressures and temperatures
- Superheat or subcooling where applicable
- Refrigerant leak evidence
- Defrost operation
- Temperature and pressure sensors
- Electric auxiliary heating stages
- Dual-fuel furnace operation
- Duct leakage and restrictions
- Equipment capacity at current outdoor conditions
- Building heating or cooling load
Do Not Diagnose From Run Time Alone
The same symptom can result from completely different conditions.
For example:
- A correctly sized inverter heat pump may run continuously and be perfectly healthy.
- An undersized system may run continuously because it lacks capacity.
- A refrigerant leak may reduce capacity and create continuous operation.
- A duct leak may waste the capacity the heat pump is producing.
- A failed backup heater may leave the compressor trying to carry the entire load.
Operating measurements are required before deciding what needs repair.
Does a Constantly Running Heat Pump Need Repair or Replacement?
Continuous operation alone is not a reason to replace a heat pump.
Repair May Be Appropriate When:
- A sensor has failed
- The outdoor fan or indoor blower needs repair
- The system has an airflow restriction
- A thermostat is configured incorrectly
- A repairable refrigerant leak is confirmed
- The auxiliary heat has an electrical fault
- A control component has failed
System Modification May Be Required When:
- Return airflow is inadequate
- Ductwork is undersized
- Rooms are poorly balanced
- The outdoor unit is badly located
- The backup heating strategy is incorrect
Replacement May Be Considered When:
- The system is old and requires repeated major repairs
- The compressor has failed
- Coils have recurring refrigerant leaks
- Parts are difficult to obtain
- The system was significantly mis-sized
- The existing equipment cannot meet the current building load
- A major renovation has changed the home’s heating and cooling requirements
A replacement recommendation should explain what problem the new design will correct.
Heat Pump Running Constantly: Homeowner Checklist
Check Before Calling
- Confirm Heat or Cool mode.
- Check thermostat temperature.
- Check Fan Auto versus Fan On.
- Check schedules and Hold settings.
- Inspect the central filter.
- Clean ductless filters if needed.
- Open supply registers.
- Clear return grilles.
- Keep indoor units unobstructed.
- Clear loose debris around the outdoor unit.
- Check for heavy outdoor ice.
- Record fault codes.
- Compare room temperature with the setpoint.
- Notice whether backup heat is operating.
Information to Give the Technician
- How long the system has been running
- Outdoor temperature
- Indoor temperature
- Thermostat setpoint
- Whether the problem occurs in heating, cooling or both
- Whether airflow feels normal
- Whether auxiliary heat is active
- Any fault code
- Recent maintenance or repairs
- Recent thermostat or renovation changes
Heat Pump Diagnostic Service in Metro Vancouver and Fraser Valley
Bernoulli Heating and Cooling provides diagnostic and repair service for ducted, ductless, multi-zone, full-electric and dual-fuel heat pump systems.
When a heat pump runs continuously, we can evaluate thermostat operation, airflow, filters, coils, ductwork, defrost, refrigerant performance, electrical components, backup heating and equipment capacity to determine whether the run time is normal or caused by a system problem.
The current diagnostic appointment charge for an existing heat pump is $135. Repair labour, refrigerant, replacement parts and additional materials are quoted separately when required.
New heat pump installation estimates are free.
Call 604-518-4438 or email heatingbernoulli@gmail.com to arrange service.
Explore local heat pump installation information:
For homeowner operating guidance, review the official ENERGY STAR air-source heat pump guidance and Natural Resources Canada heating and cooling with a heat pump guide.
Heat Pump Running Constantly: Frequently Asked Questions
Is it normal for a heat pump to run all day?
Yes, it can be. Modern variable-capacity heat pumps may run for many hours at low output. Continuous operation is more concerning when the system cannot maintain the thermostat setting, runs at maximum output continuously or develops other symptoms.
Is it normal for a heat pump to run all night?
It can be normal during colder overnight temperatures because the home’s heating load increases. The system should still maintain a reasonably stable indoor temperature.
Why does my heat pump never shut off in winter?
Possible reasons include cold weather, normal variable-speed operation, thermostat settings, dirty filters, low airflow, frequent defrost, low refrigerant, failed backup heat, duct leakage or undersized equipment.
Why does my heat pump run constantly when it is only slightly cold outside?
A variable-speed system may intentionally run at low capacity. If it cannot maintain temperature in mild weather, airflow, refrigerant, controls, ductwork and equipment sizing should be inspected.
Should my heat pump cycle on and off?
Fixed-capacity equipment normally cycles. Variable-capacity equipment may operate for much longer periods and reduce output instead of shutting off.
Is continuous heat pump operation bad for the compressor?
Normal steady operation within the manufacturer’s operating range is not inherently harmful. Repeated short cycling, abnormal pressures, low airflow and operating faults are generally more concerning.
Does running constantly mean my heat pump is undersized?
No. A correctly sized variable heat pump may run continuously during peak weather. Undersizing becomes more likely when the system remains at maximum output and cannot maintain temperature.
Why does my new heat pump run much longer than my old furnace?
Heat pumps usually provide lower-temperature heat over longer periods, while furnaces often provide hotter air in shorter cycles. Longer run time can be normal after conversion from a furnace.
Why is the indoor fan always running?
The thermostat may be set to Fan On or Circulate, or the equipment may intentionally operate the fan for air circulation or ventilation. Check the thermostat fan setting.
Why is the outdoor unit always running?
The compressor may be modulating at low capacity. Continuous outdoor-unit operation can also result from high building load, low refrigerant, airflow problems, incorrect sizing or control faults.
Why does my heat pump run constantly but the house is still cold?
Possible causes include low airflow, dirty coils, refrigerant problems, failed backup heat, duct leakage, heavy building heat loss, undersized equipment or a control problem.
Why does my heat pump run constantly but only some rooms are cold?
The problem may be air distribution rather than total equipment capacity. Check branch ducts, dampers, return paths, room heat loss and ductless indoor-unit coverage.
Will a dirty filter make a heat pump run constantly?
Yes. A dirty filter can reduce airflow and heat transfer, forcing the system to operate longer to provide the required heating or cooling.
Can low refrigerant cause nonstop operation?
Yes. A low charge may reduce system capacity. Refrigerant should not normally need regular topping up, so low charge should be investigated for a leak or previous charging problem.
Can a bad thermostat make a heat pump run continuously?
Yes. An inaccurate temperature sensor, incorrect fan setting, wiring problem or control configuration can prevent the system from receiving the correct stop command.
Why does my heat pump run continuously after I raise the thermostat?
The system may be recovering from a temperature setback. Large increases can require long run times and may activate auxiliary heat.
How long should it take a heat pump to raise the house temperature?
There is no universal time. Recovery depends on the size of the temperature change, outdoor conditions, building heat loss, equipment capacity, airflow and backup heating.
Does continuous operation make my electric bill high?
Not necessarily. A variable heat pump can run continuously at low power. Electricity use depends more on compressor capacity, backup heat, outdoor temperature, building load and efficiency than run time alone.
Why did my electricity bill increase after installing a heat pump?
The heat pump may now be providing heating previously supplied by gas or another fuel, so electricity use naturally increases. Weather, thermostat settings, auxiliary heat and total household consumption also need to be considered.
How do I know if auxiliary heat is running?
Some thermostats display AUX, Auxiliary Heat or a heating-stage indicator. A technician can also verify control signals and electrical current through the heating stages.
Is it bad if auxiliary heat runs constantly?
Continuous auxiliary heat during very cold conditions may be part of some designs, but operation during mild weather can indicate control, sizing, heat-pump capacity or equipment problems.
Why does my ductless mini-split never shut off?
Most ductless mini-splits use variable-speed compressors and fans. Long low-capacity operation is normal when the unit maintains temperature efficiently.
Should I turn off my heat pump to give it a rest?
No. A healthy heat pump does not need periodic rest. Turning it off can allow the home to drift away from the setpoint and create a larger recovery load later.
Can I use Emergency Heat if the heat pump runs constantly?
Emergency Heat is intended for situations where normal heat-pump operation is unavailable or unsafe. It should not be used simply because the heat pump has a long run time.
When should I call a technician?
Arrange diagnosis when the system cannot maintain temperature, airflow becomes weak, backup heat behaves abnormally, the outdoor coil stays iced, fault codes appear, energy use changes sharply or the equipment develops unusual mechanical or electrical symptoms.
How much is a Bernoulli heat pump diagnostic appointment?
Bernoulli Heating and Cooling currently charges $135 for a diagnostic appointment on an existing heat pump system. Repairs, refrigerant, replacement parts and additional materials are separate.