Independent guide
AC repair
Why an AC stops working, what to check, and what repairs usually cost.
Check these first
- Thermostat is set to Cool and the target is below room temperature.
- Replace the thermostat batteries if it has any.
- Check the air filter. A clogged one can block airflow.
- Clear leaves and debris from around the outdoor unit.
Still not working? That's a job for a pro.
When to call a pro
The problem is still there after these checks. Anything inside the unit is a job for a pro.
What AC repair usually costs
| Source | Cost, US | Page date |
|---|---|---|
| Thumbtack | Average about $300 | Jul 2026 |
| Fixr | $250 to $700, average $375 | Jan 2026 |
| HomeGuide | $150 to $650, average $360 | Aug 2025 |
| Today's Homeowner | $250 to $600 | May 2025 |
| This Old House | $150 to $650Built from Angi contractor estimates and Home Depot prices. | Mar 2026 |
Prices are national, not for a single city. More on repair costs.
Questions
Why does my AC keep shutting off?
An AC that turns on and off too often can wear out its own controls, so frequent cycling is worth taking seriously. Check that the filter is clean and the thermostat is working. If it keeps happening, have a professional check the unit's electrical connections.
Source: energy.gov
Why does my AC smell musty?
A musty smell usually points to mold or dampness somewhere in the home, and it should be investigated. An AC collects moisture, so a technician can check the system. Do not ignore the smell, and do not open the unit yourself.
Source: epa.gov
What does an AC tune-up include?
A typical visit includes checking the thermostat settings and electrical connections, oiling moving parts, checking the water drain, cleaning the coils, checking the refrigerant level, and cleaning the fan parts that move air. Technicians do all of this.
Source: energystar.gov
Should I try to fix my AC myself?
Only simple upkeep is safe for homeowners, such as changing the air filter and clearing leaves and debris from around the outdoor unit. For anything more than basic maintenance, hire a professional. Do not open the unit.
Source: energy.gov
Describe the problem
What kind of system is it?
Prices on our pages come from the sources linked next to them. How we work