Why Is My AC Running But Not Cooling Properly?

An AC that runs but doesn’t cool usually points to poor airflow, dirty coils, low refrigerant, or a thermostat/control issue. The most common cause is a clogged filter or an outdoor condenser blocked by dirt and yard debris. A focused diagnostic finds the root problem, and our technicians can complete most repairs the same day after upfront pricing. We handle these issues for homeowners throughout the Leroy area every week. A quick technician hint: cooling that fades after a few minutes often means the evaporator is icing from restricted airflow.

Try these quick checks before a service visit:

• Replace or rinse the air filter; open all vents.
• Set thermostat to Cool, Fan Auto, and lower a few degrees.
• Clear debris from the outdoor unit; gently rinse fins with power off.
• Verify breaker is on and the condensate drain isn’t tripped.

If the system still won’t cool, turn it off to prevent damage and schedule a diagnostic. <br/> Updated: 2026-05-16 <br/> Need help in Leroy, IN? Call (219) 500-8867 or book online. "Everyone I’ve dealt with at Summers has been great." — Babette L.