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AC Not Cooling the House
in Arlington, TX
Arlington summers regularly push past 100 degrees, and your AC has to work hard for months without a break. When it stops keeping up, the problem is usually inside the unit itself — a dirty coil, low refrigerant, or a failing part. Left alone, the system will keep running and running without cooling anything, which wears it out faster and drives up your electric bill.
Quick Answer
When your AC runs but the house won't cool down, the most common cause in Arlington is low refrigerant or a dirty condenser coil. The fix is either recharging the refrigerant or cleaning the coil so heat can move out of your home. If the refrigerant is low, there's almost always a leak that needs to be found first. Call (817) 670-3733 to have someone look at it before the next heat wave hits.
Telltale Signs
Warning Signs to Watch For
- The air coming out of the vents feels warm or only slightly cool
- The AC runs almost constantly but the thermostat never hits your set temperature
- The outdoor unit is running but you feel no air movement inside
- Your electric bill jumped without any change in how you use the AC
- Ice is forming on the copper lines near the indoor unit
- The house cools down at night but can't keep up during the day
Root Causes
What Causes AC Not Cooling the House?
Low Refrigerant From a Leak
Refrigerant is the fluid that pulls heat out of your home. When there's a slow leak in the copper lines or the coil, the system loses its ability to move heat outside. In Arlington's long cooling season, units run so many hours that small leaks that might go unnoticed elsewhere become a real problem by mid-July.
The Fix
Leak Detection and Refrigerant Recharge
A technician finds the leak using a detector or dye, repairs it, and then recharges the system to the right level. Just adding refrigerant without fixing the leak means you'll be back in the same spot in a few weeks.
Dirty Condenser Coil
The condenser coil sits in the outdoor unit and dumps heat outside. When it gets clogged with dirt, cottonwood fluff, or grass clippings, heat can't escape and the system struggles to cool. Homes in older parts of Arlington like Dalworthington Gardens with large trees nearby see this problem more often.
The Fix
Condenser Coil Cleaning
A technician washes the coil with a coil cleaner and rinses it out so airflow is restored. Doing this once a year before summer starts keeps the unit running at full capacity.
Undersized or Failing Compressor
The compressor is the pump that moves refrigerant through the system. When it starts failing, it can't push refrigerant properly and the cooling drops off. Systems installed in houses built in the 1990s or earlier often have compressors that are reaching the end of their life.
The Fix
Compressor Replacement or System Replacement
A failing compressor can sometimes be replaced on its own, but depending on the age of the unit, replacing the full system may make more sense. A technician can test the compressor to tell you which direction is worth going.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Low Refrigerant From a Leak | Dirty Condenser Coil | Undersized or Failing Compressor |
|---|---|---|---|
| Ice forming on the lines or indoor coil | |||
| Outdoor unit is hot to stand near and fan is spinning slowly | |||
| Unit runs but makes a grinding or rattling sound | |||
| Electric bill is high and house never reaches set temperature | |||
| System trips the breaker when it tries to start |
Free Inspection
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An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
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