5 Quick Fixes for AC Not Cooling
Introduction
When your air conditioner is running but not cooling, it’s frustrating—especially on a hot day. Before you call a technician, try these five fast, safe DIY fixes. Each takes under 15 minutes and uses no special tools.
1. Check the Thermostat Settings
What to do: Ensure the thermostat is set to Cool, the fan on Auto, and the target temperature is at least 5°F below room temperature.
⏱️ Time: 1 minute
⚙️ Difficulty: 1/5
⚠️ Safety: No electrical work needed.
2. Replace or Clean the Air Filter
What to do:
Turn off your system.
Slide out the filter from the return-air grille or furnace.
If reusable, rinse under running water and let dry; if disposable, swap for a new 1″ pleated filter.
⏱️ Time: 5 minutes
⚙️ Difficulty: 2/5
⚠️ Safety: Always turn off power at the breaker.
3. Inspect the Outdoor Unit for Debris
What to do:
Power off the outdoor condenser at its disconnect box.
Remove leaves, grass, and sticks around the coil.
Spray gently with a garden hose from the inside out.
⏱️ Time: 10 minutes
⚙️ Difficulty: 2/5
⚠️ Safety: Do not use a pressure washer; avoid bending fins.
4. Reset the Circuit Breaker
What to do:
Find your main electrical panel.
Look for a tripped breaker labeled “AC” or “Outdoor Unit.”
Flip it fully OFF, then back ON.
⏱️ Time: 1 minute
⚙️ Difficulty: 1/5
⚠️ Safety: Wear rubber-soled shoes; keep hands dry.
5. Check the Condensate Drain
What to do:
Locate the secondary drain pan under the indoor coil.
If full, clear the PVC drain line by pushing a wet-dry vacuum on the outdoor drain opening.
⏱️ Time: 5 minutes
⚙️ Difficulty: 2/5
⚠️ Safety: Turn off system to avoid water damage.
When to Call a Professional
If none of these steps restore cool air, your system may have refrigerant leaks, compressor issues, or control-board faults. Chat with our AI tool for next steps or contact a licensed HVAC technician.