Should I replace a heat pump just because auxiliary heat is running?

No. Auxiliary heat can be part of normal cold-weather operation, defrost or recovery from a thermostat setback. Persistent use with poor comfort or unusually high consumption needs diagnosis of the outdoor unit, airflow, controls and backup heat. The findings—not the thermostat label alone—should guide repair versus replacement.

Is cool-feeling air always a heat-pump failure?

Not always. Heat-pump supply air can feel less hot than furnace air while the system is still raising the room temperature. A room that keeps getting colder, unusually long runtime, frequent backup-heat calls, a new noise, or a change from the system's normal behavior is more useful evidence of a problem.

Is frost on the outdoor unit normal?

A light, temporary frost layer can form in heating mode; the system should periodically enter defrost and clear it. A solid ice coating, ice that remains after a defrost attempt, blocked airflow, or repeated loss of heat is not something to wait out and needs diagnosis.

What is the safe next step when the outdoor unit is iced over?

Do not chip the coil, pour hot water on it, or reach into the fan. Keep people clear, check only that leaves or snow are not blocking the unit, and request repair if the ice persists or heat is falling off. If the system cannot maintain a safe indoor temperature, use an available backup source according to its instructions rather than improvising with an oven or stove.

What is the difference between AUX and Emergency Heat?

AUX Heat usually means the thermostat has called supplemental heat while the heat pump continues or attempts to carry the load; on many systems that supplemental source is electric resistance. Emergency Heat is a manual setting that locks out the heat pump and calls the backup source alone. Labels and equipment differ, so persistent AUX or Emergency Heat operation deserves diagnosis rather than leaving the setting forced on.

What else can cause weak heat or high bills?

Restricted airflow, a dirty coil, a control or sensor fault, refrigerant-side trouble, a reversing-valve problem, electrical issues, duct leakage, or excessive backup-heat operation can look similar from the thermostat. Testing temperatures, pressures, amperage, airflow, and controls helps separate those causes.

What can I check before calling?

Confirm the thermostat is in the intended mode, use the equipment-specified filter, keep supply and return openings clear, and keep snow, leaves, and stored items away from the outdoor unit. Avoid repeatedly resetting breakers or changing refrigerant, wiring, defrost, or safety settings yourself.

Heat Pump Repair in Warminster, PA

Summary: LegendAir Heating & Cooling provides heat-pump repair in Warminster, PA. Repairs cost $150 to $600 for common issues. Diagnosis can address refrigerant leaks, defrost failures, reversing-valve problems, and compressor concerns. Call for current appointment availability.

What Heat Pump Problems Does LegendAir Fix?

LegendAir diagnoses common heat-pump problems for Warminster and Bucks County homes, including:

Frozen outdoor coils and defrost cycle failures
Reversing valve malfunctions (stuck in heating or cooling mode)
Low refrigerant and refrigerant leaks
Compressor failure or hard starting
Thermostat communication problems
Unusual noises (grinding, rattling, buzzing)
Heat pump not heating in winter
Heat pump not cooling in summer

How Much Does Heat Pump Repair Cost in Warminster?

Heat pump repair in Warminster costs $150 to $600 for common issues like capacitor replacement, thermostat problems, or defrost board repair. Compressor or reversing valve repairs can cost $800 to $2,000. LegendAir provides upfront pricing for Bucks County homeowners. Call (215) 317-6099.

Why Is My Heat Pump Not Heating?

A heat pump not heating in winter can be caused by a stuck reversing valve, low refrigerant, a frozen outdoor unit with defrost-board failure, or a dirty air filter restricting airflow. Pennsylvania’s cold winters put extra strain on heat pumps. LegendAir provides diagnosis in Warminster and Bucks County; call (215) 317-6099 for current appointment availability.

Related Heat Pump Services

What is different about heat-pump diagnosis?

LegendAir provides heat-pump repair in Warminster and nearby Bucks and Montgomery County communities. For no heat, persistent ice, weak airflow, or unusual backup-heat operation, request diagnosis of the existing system. Normal defrost and cold-weather operation must be distinguished from a repairable fault before recommending parts or replacement.

Should I replace a heat pump just because auxiliary heat is running?: No. Auxiliary heat can be part of normal cold-weather operation, defrost or recovery from a thermostat setback. Persistent use with poor comfort or unusually high consumption needs diagnosis of the outdoor unit, airflow, controls and backup heat. The findings—not the thermostat label alone—should guide repair versus replacement.
How do I book heat-pump repair, and what is the trip charge?: Call LegendAir at (215) 317-6099 or use the service-booking form. Describe the symptoms, thermostat messages, and whether the system is maintaining indoor temperature. The trip charge is $99.99. It covers travel, a full system inspection, and a written repair estimate, and is applied to the approved repair. Same-day appointments may be available subject to technician availability. No-heat and no-cooling calls receive priority dispatch seven days a week.
Is cool-feeling air always a heat-pump failure?: Not always. Heat-pump supply air can feel less hot than furnace air while the system is still raising the room temperature. A room that keeps getting colder, unusually long runtime, frequent backup-heat calls, a new noise, or a change from the system's normal behavior is more useful evidence of a problem.
Is frost on the outdoor unit normal?: A light, temporary frost layer can form in heating mode; the system should periodically enter defrost and clear it. A solid ice coating, ice that remains after a defrost attempt, blocked airflow, or repeated loss of heat is not something to wait out and needs diagnosis.
What is the safe next step when the outdoor unit is iced over?: Do not chip the coil, pour hot water on it, or reach into the fan. Keep people clear, check only that leaves or snow are not blocking the unit, and request repair if the ice persists or heat is falling off. If the system cannot maintain a safe indoor temperature, use an available backup source according to its instructions rather than improvising with an oven or stove.
What is the difference between AUX and Emergency Heat?: AUX Heat usually means the thermostat has called supplemental heat while the heat pump continues or attempts to carry the load; on many systems that supplemental source is electric resistance. Emergency Heat is a manual setting that locks out the heat pump and calls the backup source alone. Labels and equipment differ, so persistent AUX or Emergency Heat operation deserves diagnosis rather than leaving the setting forced on.
What else can cause weak heat or high bills?: Restricted airflow, a dirty coil, a control or sensor fault, refrigerant-side trouble, a reversing-valve problem, electrical issues, duct leakage, or excessive backup-heat operation can look similar from the thermostat. Testing temperatures, pressures, amperage, airflow, and controls helps separate those causes.
What can I check before calling?: Confirm the thermostat is in the intended mode, use the equipment-specified filter, keep supply and return openings clear, and keep snow, leaves, and stored items away from the outdoor unit. Avoid repeatedly resetting breakers or changing refrigerant, wiring, defrost, or safety settings yourself.

Sources

ENERGY STAR air-source heat-pump criteria (Heating performance, cold-climate, and efficiency criteria). Reviewed September 5, 2026.
U.S. Department of Energy: air-source heat-pump guidance (Homeowner context on air-source heat-pump operation, performance, and maintenance; model documentation and a site diagnosis still control). Reviewed September 5, 2026.
Carrier consumer heat-pump information (One manufacturer's consumer product context; exact model documentation controls and this does not establish LegendAir credentials or procedures). Reviewed September 5, 2026.
U.S. CPSC carbon-monoxide safety guidance (General carbon-monoxide alarm and emergency-response guidance; it is not HVAC diagnosis or evidence of LegendAir credentials or procedures). Reviewed September 5, 2026.

Choose heat-pump repair, maintenance, or replacement

Book a heat-pump diagnostic visit
Tell us what changed, any thermostat messages, and whether the house is maintaining temperature.
Plan maintenance for a working heat pump
Review the seasonal service scope and manufacturer guidance; an active fault needs diagnosis first.
Compare heat-pump installation and replacement
Review winter capacity, backup heat, ducts, electrical work, and the complete estimate before selecting equipment.

A free replacement estimate is different from a repair diagnosis. The trip charge is $99.99. It covers travel, a full system inspection, and a written repair estimate, and is applied to the approved repair. If you smell gas, see smoke, or hear a carbon-monoxide alarm, leave the building and contact 911 or the utility from outside first.

ENERGY STAR heat-pump criteria include heating performance at lower outdoor temperatures. Compare the selected model’s capacity with the home’s measured load and current PECO or manufacturer rebate requirements.

Information current as of 2026. Pricing, rebate, and efficiency figures are reviewed regularly to reflect current rates in the Warminster, PA and Bucks County market.

Frequently Asked Questions

Should I replace a heat pump just because auxiliary heat is running?: No. Auxiliary heat can be part of normal cold-weather operation, defrost or recovery from a thermostat setback. Persistent use with poor comfort or unusually high consumption needs diagnosis of the outdoor unit, airflow, controls and backup heat. The findings—not the thermostat label alone—should guide repair versus replacement.
How do I book heat-pump repair, and what is the trip charge?: Call LegendAir at (215) 317-6099 or use the service-booking form. Describe the symptoms, thermostat messages, and whether the system is maintaining indoor temperature. The trip charge is $99.99. It covers travel, a full system inspection, and a written repair estimate, and is applied to the approved repair. Same-day appointments may be available subject to technician availability. No-heat and no-cooling calls receive priority dispatch seven days a week.
Is cool-feeling air always a heat-pump failure?: Not always. Heat-pump supply air can feel less hot than furnace air while the system is still raising the room temperature. A room that keeps getting colder, unusually long runtime, frequent backup-heat calls, a new noise, or a change from the system's normal behavior is more useful evidence of a problem.
Is frost on the outdoor unit normal?: A light, temporary frost layer can form in heating mode; the system should periodically enter defrost and clear it. A solid ice coating, ice that remains after a defrost attempt, blocked airflow, or repeated loss of heat is not something to wait out and needs diagnosis.
What is the safe next step when the outdoor unit is iced over?: Do not chip the coil, pour hot water on it, or reach into the fan. Keep people clear, check only that leaves or snow are not blocking the unit, and request repair if the ice persists or heat is falling off. If the system cannot maintain a safe indoor temperature, use an available backup source according to its instructions rather than improvising with an oven or stove.
What is the difference between AUX and Emergency Heat?: AUX Heat usually means the thermostat has called supplemental heat while the heat pump continues or attempts to carry the load; on many systems that supplemental source is electric resistance. Emergency Heat is a manual setting that locks out the heat pump and calls the backup source alone. Labels and equipment differ, so persistent AUX or Emergency Heat operation deserves diagnosis rather than leaving the setting forced on.
What else can cause weak heat or high bills?: Restricted airflow, a dirty coil, a control or sensor fault, refrigerant-side trouble, a reversing-valve problem, electrical issues, duct leakage, or excessive backup-heat operation can look similar from the thermostat. Testing temperatures, pressures, amperage, airflow, and controls helps separate those causes.
What can I check before calling?: Confirm the thermostat is in the intended mode, use the equipment-specified filter, keep supply and return openings clear, and keep snow, leaves, and stored items away from the outdoor unit. Avoid repeatedly resetting breakers or changing refrigerant, wiring, defrost, or safety settings yourself.