If your heat pump feels like it is blowing lukewarm or cool air in winter, first note that heat pumps naturally supply air at 90°F to 95°F (which feels cooler than body temperature compared to a 130°F gas furnace). If the air turns truly cold for 5 to 10 minutes while steam rises from the outdoor unit, your system is simply in a normal defrost cycle. However, if cold air blows continuously, the outdoor unit is encased in thick ice, or the thermostat displays "Aux Heat" without warming the home, you have a failed reversing valve, burnt auxiliary heat strip, or low refrigerant.
Heat pumps are increasingly common across Broomall and neighboring communities like Conshohocken. Understanding their unique refrigeration cycle prevents unnecessary panic while identifying genuine mechanical faults.
How the Automated Defrost Cycle Operates
In Delaware County, damp winter air freezing on outdoor heat pump coils is inevitable. To clear this frost, the system’s logic board automatically reverses the refrigerant flow for several minutes. In cooling mode, hot refrigerant melts outdoor ice. Indoor electric resistance coils should energize to temper the indoor air stream so your family doesn’t feel a sudden cold draft.
If those indoor electric heat strips fail or trip a breaker, unheated 55°F air blows directly into your living room during defrost.
Signs of a True Heat Pump Mechanical Failure
- Continuous Cold Air for Over 20 Minutes: The defrost cycle should never exceed 10 to 12 minutes.
- Solid Block of Ice Encasing the Cabinet: Indicates a failed defrost control board, bad ambient temperature sensor, or broken reversing valve solenoid.
- Loud Grinding or Rattling Noises Outside: Points to mechanical compressor valve failure or an outdoor fan motor hitting ice build-up.
Switching to Emergency Heat
If your heat pump is blowing cold air and outdoor ice is spreading, switch your thermostat setting from "Heat" to "Emergency Heat" (EM Heat). This locks out the outdoor compressor and runs your indoor backup heating safely until a technician arrives.
Need emergency heating or AC repair in Broomall?
Dispatchers are on call 24 hours a day to send an insured technician to your home.
Professional Heat Pump Service in Delaware County
Our network provides 24/7 emergency heat pump troubleshooting throughout Delaware and Montgomery Counties. Learn more on our heat pump repair page or call (321) 478-0693.