What should I do if my heat pump is not cooling?

What this symptom usually means

When a heat pump is not cooling, the key issue is that the refrigeration cycle is running incorrectly or not running fully. The thermostat may call for cooling and the indoor fan may still move air, but if the outdoor section is not removing heat, the air coming from the vents will feel neutral, slightly cool, or warm instead of clearly colder than the room.

What your observations can tell you

Normal airflow with poor cooling points first to the outdoor unit, refrigerant charge, reversing valve, or compressor operation. Weak airflow points more toward a frozen indoor coil, blower problem, or duct issue. If you see ice on the refrigerant line or air handler, cooling often falls off before airflow gets very weak; if you find water later, that is commonly meltwater after the ice begins to thaw, not a separate leak problem.

A new noise helps narrow it down. Rapid clicking outside can mean a contactor or start component problem, a loud hum without strong cooling can point to compressor starting trouble, and a blower that sounds normal indoors while the outdoor unit stays unusually quiet often means the outdoor section is not actually operating. If only one room or zone stays hot, the issue is less likely to be the refrigerant circuit and more likely to involve zone dampers, branch duct leakage, or airflow balancing.

What to do before service

If you see ice, switch the thermostat off and give the system 30 to 60 minutes to start thawing before service, because a frozen coil can hide the original fault. If there is no ice and the system runs but does not cool, avoid repeatedly lowering the thermostat far below room temperature; that usually does not fix the problem and can add stress if the compressor is already struggling. Refrigerant and electrical diagnosis inside the equipment should be left to a qualified technician.

What a service visit usually includes

A technician typically confirms the temperature split across the indoor coil, checks whether the outdoor fan and compressor are both operating, tests capacitors and contactors, measures refrigerant pressures and line temperatures, inspects for ice or airflow restriction, and verifies whether the reversing valve is shifting into cooling mode. If one room or zone is the problem, they may also inspect dampers, duct connections, and static pressure rather than focusing only on the heat pump cabinet.

What affects repair cost

Cost depends on whether the fix is an electrical component, an airflow repair, or a sealed-system problem. Typical 2025–2026 U.S. repair ranges are roughly $150–$450 for a capacitor or contactor, $300–$900 for a blower motor or control issue, $200–$1,200 for refrigerant leak testing and recharge depending on refrigerant type and leak location, and $1,500–$4,000 or more for major compressor or coil repairs. Zoning and duct repairs vary widely because access to dampers, attics, and concealed runs often matters as much as the part itself.