What Homeowners Can Check Before Calling for AC Repair

You don't need to become an HVAC technician before calling for service. A few safe checks can rule out simple problems and give the technician better information.

1. Check the thermostat

Confirm it's set to Cool, the target temperature is below room temperature, the display works, and the batteries are good if it uses them.

2. Check the filter

Inspect the filter and clean or replace it according to the manufacturer's directions if needed.

3. Check the vents

Make sure supply registers are open and not covered by furniture, curtains, or rugs.

4. Check normal household power

Look at the electrical panel. If the HVAC breaker has tripped, reset it once. If it trips again, stop and leave it. Repeated trips need diagnosis.

5. Look at the outdoor equipment

From outside the cabinet, check for leaves, vegetation, or debris blocking airflow. Don't remove panels.

6. Pay attention to what the system is doing

Before calling, note:

• Is air moving from the vents?
• Is the air cold, warm, or room temperature?
• Is the outdoor unit running?
• Is there water?
• Is there ice?
• Are there unusual sounds or odors?
• Is the whole house affected?

That information is more useful than "my AC is broken."

Know when to stop

Smoke, burning odors, repeated breaker trips, or severe mechanical noises are reasons to stop operating the equipment entirely. If these checks don't reveal a simple cause: Find Local HVAC Help