Why Is My AC Not Cooling?
An air conditioner that runs but does not cool the house is one of the most common cooling complaints in San Angelo. The cause can be as simple as a dirty filter or as involved as a refrigerant leak. This guide walks through the common reasons and what to check before requesting service.
Common Causes
- A clogged air filter that restricts airflow over the coil.
- A low refrigerant charge, which usually points to a leak.
- A dirty outdoor condenser coil that cannot release heat.
- A failed capacitor or contactor that stops the outdoor unit from running.
- A thermostat set incorrectly or reading the wrong temperature.
What to Check First
Start with the air filter. A dirty filter is the single most common cause of weak or warm airflow, and replacing it is safe for any homeowner. Next, confirm the thermostat is set to cool and is lower than the room temperature. Then check the outdoor unit to see whether the fan is spinning. Read more in our AC not cooling service page.
When to Request Service
If the filter is clean and the thermostat is set correctly but the home still will not cool, the cause is likely refrigerant, an electrical component, or the compressor. Those require professional diagnosis. This site does not provide DIY instructions for handling refrigerant or working inside energized equipment.
FAQs
Why is my AC running but not cooling?
Common causes include a dirty filter, low refrigerant, a dirty condenser coil, or a failed outdoor component like a capacitor.
Can a dirty filter stop the AC from cooling?
Yes. A badly clogged filter restricts airflow over the indoor coil, which can reduce cooling and even cause the coil to freeze.
Related HVAC Pages
Need HVAC Help?
Call 325-939-8533 or get a free quote. San Angelo HVAC Pros helps San Angelo area property owners with HVAC service.