Summers Plumbing Heating & Cooling explains that an AC running but not cooling usually points to airflow restriction, dirty coils, low refrigerant, or a thermostat or duct issue. The most common cause is a clogged air filter or a blocked outdoor condenser that can’t shed heat. We often see this lead to a freezing indoor coil, which makes airflow feel weaker the longer it runs. If the system is otherwise healthy, these problems are typically repairable; replacement is considered when there’s a major refrigerant leak or compressor failure. Our team handles this problem frequently for homeowners around Lebanon and the greater Dayton area, and we offer 24/7 emergency help when cooling stops at inconvenient times.
Before you call, try these quick checks:
- Replace a dirty filter and open supply vents
- Clear 2–3 feet of debris around the outdoor unit
- Confirm thermostat is set to Cool and Fan Auto
- Verify breakers and the outdoor disconnect are on
If you see ice on the refrigerant lines, turn the system off and schedule a diagnostic to protect the compressor.
Updated: 2026-06-18
Need help in Lebanon, OH? Call (326) 356-0025 or book online.