AC Not Cooling? Here's The Homeowner Checklist Before You Call A Pro
Before you book a service call, run through this 6-step DIY troubleshooting checklist. About half of the "broken AC" calls we get in Raleigh turn out to be a clogged filter, a dead thermostat battery, or a tripped breaker — things you can fix in five minutes.
DIY Checklist
Work through these in order. Most no-cool issues are solved by step 1, 2, or 3.
1. Check your thermostat first
Make sure it's set to Cool (not Fan or Heat), the target temperature is at least 3°F below the current room temp, and the screen is actually on. Dead batteries are responsible for more no-cool calls than most homeowners realize.
2. Swap the air filter
Pull the filter out and hold it up to a light. If light barely passes through, it's choking your system. A dirty filter restricts airflow, freezes the indoor coil, and stops cool air from reaching your vents. Replace every 1–3 months.
3. Reset the breaker
Find the breaker labeled AC, Air Handler, or Furnace in your main electrical panel. Flip it fully off, wait 30 seconds, and flip it back on. If it trips again immediately, stop — you have an electrical issue that needs a pro.
4. Clear the outdoor condenser
Shut off power at the outdoor disconnect box. Remove leaves, grass clippings, and debris from around the unit, and gently rinse the metal fins with a garden hose on low pressure (top down). Keep at least 2 feet of clearance on all sides.
5. Check the condensate drain
Look for a small white PVC pipe near the indoor air handler. If it's clogged, a safety float switch will shut the system off so it doesn't flood your home. A wet/dry vac on the outdoor end of that pipe usually clears it.
6. Look (and listen) at the vents
Walk room to room. Is air coming out of every vent? Is it warm, room-temperature, or cold? Closed/blocked vents and crushed flex duct in the attic are surprisingly common causes of 'AC not cooling' calls.
When To Stop And Call A Pro
HVAC systems involve high-voltage electricity and pressurized refrigerant. If you see any of these, skip the DIY and book a technician:
- The breaker trips again the moment you reset it
- You see ice on the refrigerant lines or indoor coil
- The outdoor unit hums but the fan doesn't spin
- There's a burning, chemical, or musty smell from the vents
- Water is pooling around the indoor unit
- The system is over 10 years old and cooling weakly even after a filter change
Frequently Asked Questions
Why is my AC running but not cooling the house?
The two most common causes are a clogged air filter restricting airflow and low refrigerant from a leak. A dirty outdoor condenser coil also forces the system to work harder without delivering cold air.
How much does AC repair cost?
In the Raleigh area, most common AC repairs (capacitor, contactor, drain clear, thermostat) run $150–$450. Refrigerant leaks and compressor work cost more. Always ask for an upfront quote before any work begins.
Can I add refrigerant to my AC myself?
No. Refrigerant handling requires EPA certification, and if your system is low, it's because there's a leak — adding more without fixing the leak just wastes money and damages the environment.
The Chill Crew handles AC repair across Raleigh, Wake Forest, and surrounding areas.