Air conditioner runs but does not cool the home adequately

Safety: Turn off power before cleaning coils or opening panels.

• Check thermostat settings: Ensure the thermostat is set to COOL and the temperature is at least 3°F below room temperature. Verify fan is set to AUTO.
• Replace filters: Install new return air filters in the Fraser‑Johnston air handler or furnace.
• Clean coils: Clean both indoor and outdoor coils with appropriate coil cleaner and water rinse.
• Check airflow: Open all supply registers and ensure returns are not blocked by furniture or rugs.
• Measure temperature drop: With the system running 15–20 minutes, measure supply vs. return air temperature. A typical drop is 16–22°F. If much lower, call a technician to check refrigerant charge and system sizing.