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AC Not Cooling the House
in Plano, TX
When your AC blows air but the house stays warm, something is stopping the system from moving heat outside. Plano summers average over 100 days above 90 degrees, and a unit that can't keep up puts real strain on everyone inside, especially older adults and young kids. Left alone, the problem usually gets worse through the season, not better.
Quick Answer
In Plano, summers regularly hit 100 degrees or hotter, and an AC that runs without cooling usually has a refrigerant leak, a dirty coil, or a failing compressor. A technician will check pressures, clean the coil, and find where the system is losing capacity. Call (469) 960-3779 if your home won't drop below 80 degrees on a hot afternoon.
Telltale Signs
Warning Signs to Watch For
- The thermostat reads 80 or higher even though the AC has been running for hours
- Air coming from the vents feels room temperature, not cold
- The outdoor unit runs constantly but the indoor temperature barely drops
- Ice forms on the copper lines or on the indoor unit itself
- Humidity inside feels higher than normal even with the AC on
- Electric bills spike compared to the same month last year
Root Causes
What Causes AC Not Cooling the House?
Low Refrigerant from a Leak
Refrigerant is the fluid that carries heat from inside your home to the outdoor unit. When a line or coil develops a leak, the system loses the fluid it needs and can't move enough heat. In Plano, units work so hard from May through September that small leaks that sat quiet all winter get exposed fast when demand goes up.
The Fix
Leak Detection and Refrigerant Recharge
A technician finds the leak using a detector or dye, repairs the damaged line or fitting, and then recharges the system to the correct pressure. Just adding refrigerant without fixing the leak is a short-term patch that won't hold.
Dirty or Frozen Evaporator Coil
The evaporator coil inside your air handler pulls heat out of your home's air. Dust, pet hair, and debris build up on the coil over time and act like insulation, blocking heat transfer. Houses in older parts of west Plano with original ductwork often have small air leaks that pull extra dust straight onto the coil.
The Fix
Coil Cleaning and Airflow Correction
A technician cleans the coil with a safe foam cleaner, checks the drain pan underneath, and looks at airflow to make sure the coil won't freeze again. Keeping a clean filter in place is the single best way to slow buildup between service visits.
Failing Compressor
The compressor is the pump that moves refrigerant through the whole system. When it starts to fail, it can't build the pressure needed to push heat outside. Units that are 15 years or older, which covers many homes built in subdivisions like Legacy Town Center or Willow Bend in the early 2000s, are past the point where a compressor is likely to keep running reliably.
The Fix
Compressor Replacement or System Replacement
A technician runs electrical and pressure tests to confirm the compressor is the problem. Depending on the age of the unit, replacing just the compressor or replacing the full system may be the more sensible path long-term.
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 or Frozen Evaporator Coil | Failing Compressor |
|---|---|---|---|
| Ice on the refrigerant lines or indoor unit | |||
| Technician measures low refrigerant pressure | |||
| Coil is visibly coated in dust or debris | |||
| Compressor makes a loud grinding or clicking noise at startup | |||
| System runs but outdoor unit is not warm to the touch | |||
| High humidity indoors even with AC running all day |
Free Inspection
Get a Diagnosis in Plano
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
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