Heat pump runs constantly in cold weather

Heating / heat pump

AirCompDX - Field Reference for Air Compressor Techs
All HVAC symptoms
1

Below balance point — normal operation

info
CheckCalculate design balance point vs outdoor temp.
FixBelow balance point, aux heat should assist. Confirm W1 stages properly.
2

Undersized equipment / air leaks

low
CheckManual J load vs installed tons; blower door.
FixAir-seal, add insulation, or upsize (Manual J).
3

Low charge / dirty coil hurting capacity

med
CheckSuperheat/subcool; coil visual.
FixRecover/recharge; clean coils.
Safety

Pull the disconnect and lock out before opening HVAC equipment. Discharge dual-run capacitors before handling. Refrigerant recovery and brazing require EPA 608 certification and proper PPE.