Why is my AC running but not cooling?

Common causes include a dirty filter, low refrigerant from a leak, failed capacitor or contactor, dirty coils, or thermostat problems.

What should I check first if my AC is not cooling?

Confirm thermostat settings, check and replace a dirty air filter, verify power to indoor and outdoor units, and look for obvious debris around the outdoor unit.

When should I call an AC technician in Atascocita?

Call if simple checks fail, the outdoor unit is not running, ice forms on the lines, water leaks inside, or the breaker keeps tripping.

Repair Tips

AC Not Cooling: Causes & Fixes

Learn about the most common AC problems in Atascocita and how to address them for optimal performance.

Atascocita AC Repair ProsOctober 2026 · 4 min read

When your AC is running but the house stays warm, it is one of the most common calls we get in Atascocita during long Gulf Coast summers. This guide explains the usual causes, safe checks you can do, and when to call a licensed technician.

Quick safety checks before you dig deeper

Thermostat — Confirm it is set to Cool and the temperature is lower than the room. Replace batteries if the display is blank.
Air filter — A clogged filter restricts airflow and can stop cooling. Check and replace if dirty.
Breakers and disconnect — Make sure the indoor and outdoor units both have power.
Outdoor unit — Look for debris, grass, or a fan that is not spinning.

Common causes of an AC that will not cool

1. Dirty filter or restricted airflow

Restricted airflow is a leading cause of warm air and frozen coils. Replace the filter and keep supply and return vents open and clear.

2. Low refrigerant (leak)

Refrigerant is not “used up.” Low levels almost always mean a leak. A proper repair finds and seals the leak, then recharges to the correct amount under EPA rules.

3. Capacitor or contactor failure

These electrical parts often fail in the heat. The outdoor fan or compressor may not start, so the system runs but does not cool.

4. Dirty evaporator or condenser coil

Dirty coils reduce heat transfer. Professional cleaning restores capacity.

5. Thermostat or control issues

Wrong mode, failed sensors, or wiring problems can keep the system from calling for cooling.

When to call a pro in Atascocita

Call if the outdoor unit is silent, you see ice on the lines, water is leaking indoors, the breaker trips, or simple checks do not restore cooling. Licensed Texas technicians can diagnose safely and avoid further damage.

Does your AC run all day but still not keep up? Read why your AC is running constantly and how to tell normal run time from a problem.

If your AC starts and stops every few minutes instead, read about AC short cycling.