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AC Not Cooling the House
in Mesquite, TX
In Mesquite, summer temperatures regularly push past 100 degrees, and an AC that just runs without cooling is more than uncomfortable. It usually means the system is losing the fight against the heat load, often because of a refrigerant problem, a clogged coil, or a unit that was never sized right for the house. Ignored long enough, the compressor overworks itself and fails completely.
Quick Answer
When your AC runs but can't cool your home in Mesquite, it's usually low refrigerant, a dirty coil, or a unit too small for the heat load. A technician will check the refrigerant charge, clean the coil, and measure airflow. If the unit is undersized for a Texas summer, no amount of service will fix that. Call (903) 662-2954 to have it looked at before the next heat wave hits.
Telltale Signs
Warning Signs to Watch For
- The thermostat is set to 72 but the house won't get below 80
- Warm or barely cool air blows from the vents
- The outdoor unit runs constantly without shutting off
- Humidity feels high inside even with the AC on
- Electric bills spike without any change in how you use the system
- Ice forms on the copper lines going into the indoor unit
Root Causes
What Causes AC Not Cooling the House?
Low Refrigerant Charge
Refrigerant is what pulls heat out of your indoor air. When the system is low, it can't move enough heat outside, so the house stays warm. Mesquite homes built in the 1990s often still have older R-22 systems that develop slow leaks at the copper fittings over time.
The Fix
Leak Detection and Refrigerant Recharge
A technician finds the leak point, repairs it, and recharges the system to the correct pressure. Just adding refrigerant without fixing the leak is a short-term patch that won't hold.
Dirty Evaporator Coil
The evaporator coil sits inside your air handler and absorbs heat from the air. When dust and debris coat it, the coil can't absorb heat properly and the air coming out stays warm. In Mesquite, the clay dust and pollen during spring load up coils faster than most homeowners expect.
The Fix
Evaporator Coil Cleaning
A technician removes the coil access panel and cleans the coil with a foaming cleaner and low-pressure rinse. A clean coil can drop your supply air temperature by 10 degrees or more.
Undersized AC Unit
An AC unit has to be matched to the square footage and heat gain of the house. Many homes in older parts of Mesquite were fitted with smaller units when they were built and never upgraded after additions or replaced windows changed the load. When outside temperatures climb past 100 degrees, an undersized unit simply cannot keep up.
The Fix
Load Calculation and Unit Replacement
A proper Manual J load calculation figures out exactly what size unit the house needs. Installing the correctly sized system stops the endless running and actually brings temperatures down.
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 Charge | Dirty Evaporator Coil | Undersized AC Unit |
|---|---|---|---|
| Ice on the refrigerant lines near the indoor unit | |||
| Warm air at the vents even after an hour of running | |||
| Coil looks gray and matted when you shine a light on it | |||
| System short-cycles or runs nonstop all day | |||
| Refrigerant lines or fittings show oily residue |
Free Inspection
Get a Diagnosis in Mesquite
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
(903) 662-2954Free on-site inspection
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Serving Mesquite & surrounding areas
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