Your Dallas AC runs but the house stays hot? Here are the most common reasons an air conditioner stops cooling and what to check first.
Few things are worse than an air conditioner that runs and runs but never cools the house down, especially when it is 102 degrees outside. In Dallas, a unit that blows air but not cold air is one of the most common calls we get. Here is what is usually going on.
Before assuming the worst, check the simple things. A clogged air filter chokes airflow and is a leading cause of weak cooling, and North Texas dust and allergy season clog filters fast. Make sure the thermostat is set to cool and below room temperature. Check that the outdoor unit is running and not buried in leaves, grass clippings, or cottonwood fluff. Confirm no breaker has tripped.
The outdoor coil dumps your home's heat outside. When it is caked in Dallas dust and pollen, it cannot release heat, so the system runs constantly without cooling. A professional coil cleaning often restores performance dramatically.
If your system is low on refrigerant, it physically cannot absorb enough heat to cool your home. Low refrigerant almost always means a leak, not normal use, so topping it off is only a temporary patch. This is a job for a licensed tech, since refrigerant is regulated and requires proper handling and recovery.
The compressor is the heart of the system. When the capacitor that starts it weakens, or the compressor itself struggles, you get airflow without real cooling. Dallas heat is brutal on these parts because they rarely get a break during summer.
Restricted airflow or low refrigerant can cause the indoor coil to ice over, which then blocks cooling entirely. If you see ice on the lines, turn the system off and let it thaw, then call a pro to find the root cause. Running a frozen system can damage the compressor.
Anything involving refrigerant or electrical components should go to a licensed technician for both safety and warranty reasons. If a filter swap and a quick coil rinse do not bring the cold air back within an hour, it is time for a proper diagnosis. Our Dallas AC repair techs carry common parts on the truck and diagnose the exact cause same-day.
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