Usually the compressor or outdoor fan is not running, refrigerant is low, or the coil is frozen. A wrong thermostat setting is the simplest thing to rule out.
Warm air from the vents
AC Not Blowing Cold Air in Atascocita, Humble, Kingwood & Crosby
Air is coming out of the vents, but it is not cold. Start with the checks below. If they do not help, call and describe what you see so the right provider can respond.
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Tell us what is happening with your AC and we will help with the next step.
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Try this first
Quick checks for AC Not Blowing Cold Air
- ✓ Confirm the thermostat is set to Cool (not Fan or Heat) and the set point is below the current temperature.
- ✓ Replace the thermostat batteries if the display is dim or blank.
- ✓ Check and replace a dirty air filter.
- ✓ Go outside and see whether the condenser fan is running. If the indoor blower runs but the outdoor unit does not, the problem is outdoors.
- ✓ Check the breakers. Many systems have two: one for the air handler and one for the outdoor unit.
- ✓ Feel the larger copper line at the outdoor unit. If it is warm rather than cool, or iced over, note it for the call.
Likely causes
Common causes
A technician needs to confirm the actual cause. These are the usual suspects in Atascocita, Humble, Kingwood and Crosby homes.
✓
Thermostat set or wired wrong
A wrong mode, dead batteries or a failed thermostat can keep the compressor from starting.
✓
Outdoor unit not running
A failed capacitor, contactor or tripped breaker leaves only the indoor fan blowing.
✓
Low refrigerant
A leak lowers the amount of cooling the coil can produce, so the air feels lukewarm.
✓
Frozen evaporator coil
Ice stops heat exchange. Air still moves but is not cold.
✓
Compressor trouble
A failing compressor is a larger repair and is one reason to compare repair against replacement.
✓
Leaking or blocked ductwork
Cool air can be lost in the attic before it reaches the room.
Do not wait
Call right away if…
- ✓ The outdoor unit will not start at all.
- ✓ You see ice, or the air handler is dripping water.
- ✓ You smell burning or hear loud grinding.
- ✓ The breaker trips again after one reset.
- ✓ The home is already uncomfortably hot and cannot wait.
Areas we take calls from: Atascocita, Humble, Kingwood and Crosby, Texas.
If the thermostat display works and calls for cooling but the outdoor unit stays off, the issue is likely the outdoor unit or its power. A technician can confirm.
Refrigerant is a sealed system. If it is low, there is a leak that should be located and repaired.
If the system is more than 10 to 15 years old and the repair is costly, ask the provider about repair versus replacement.
Related: AC repair · Emergency AC repair · AC blowing warm air · AC not cooling: causes and fixes
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