An AC that runs but doesn’t cool usually has an airflow restriction, a heat-transfer blockage, or a refrigerant problem keeping heat from leaving your home. The most common cause we see is reduced airflow from a clogged filter or a matted indoor coil, which makes the system run long with little cooling. A technician can separate airflow issues from refrigerant faults by checking temperature drop and coil condition; a frozen coil often points to weak airflow rather than a leak. Our technicians handle this problem across the Chicago area, including River Forest homes. Our Energy Savings Program includes a 30-point AC maintenance that helps prevent many of these issues.
Try these quick checks before calling:
- Set thermostat to Cool, fan Auto, and 3–5°F below room temp.
- Replace a dirty 1-inch filter and open closed supply/return vents.
- Clear 2 feet around the outdoor unit and gently rinse the coil fins.
- Call if you see ice on refrigerant lines or feel weak, warm airflow at vents.
If you find ice, turn the system Off and let it thaw before running it again to protect the compressor.
Updated: 2026-07-05
Need help in River Forest, IL? Call (773) 320-5395 or book online.