Why Is My Heat Pump Running But Not Cooling Properly?

A heat pump that runs but doesn’t cool usually has restricted airflow, incorrect refrigerant charge, or a thermostat/control issue. The most common culprit is a dirty filter or blocked airflow that forces longer run times with little cooling. Our technicians see these patterns across Chicago’s North Shore and often find older ducts leaking or undersized returns reducing performance. Low refrigerant from a leak also cuts capacity, and mis-set thermostats can keep the system from staging correctly. Emergency help is available 24/7 when cooling suddenly drops with other warning signs.

Try these quick checks before scheduling service:

• Set thermostat to Cool, Fan Auto, and replace a dirty filter to restore airflow.
• Clear leaves/debris from the outdoor unit and open all indoor supply vents.
• Look for ice on lines or the indoor coil; if you see ice, turn cooling off and run Fan to thaw, then call.
• Call promptly for new grinding/buzzing noises or a steady bill spike with weak cooling. A routine tune-up at least yearly (twice a year if used for heating and cooling) helps catch small issues before they become repairs.

Updated: 2026-02-05

Need help in Riverwoods, IL? Call (847) 440-5642 or book online.