Heat Pump in San Francisco Bay Area

A heat pump not cooling on hot days is most often caused by poor airflow, incorrect thermostat settings, or a refrigerant issue. The most common real-world trigger is a dirty or clogged air filter that chokes airflow and makes the system struggle. We install, repair, and maintain heat pumps, and we frequently see control problems that prevent smooth switching between heating and cooling modes; we also test for refrigerant leaks that sap capacity. A simple technician check is whether the air coming from a supply vent feels clearly cooler than the air at a nearby return within a minute of startup. We troubleshoot these issues throughout the Bay Area, including many Emeryville homes.

Try these quick checks before calling:

• Set the thermostat to Cool and lower the setpoint 3–5 degrees
• Replace or clean the air filter
• Clear leaves or obstructions around the outdoor unit
• Look for ice on refrigerant lines or short cycling

Shut the system off if you see ice on the outdoor unit to avoid damage until a technician inspects it.

Updated: 2026-03-31

Need help in Emeryville, CA? Call (628) 222-4283 or book online.