Six reasons your AC is not cooling your Keller home
Dirty air filter
Most common cause of weak cooling and the simplest fix you can handle yourself. A clogged filter chokes airflow across the evaporator coil. The coil drops below freezing, ices over, and your system pushes lukewarm air. Keller air carries plenty of cedar pollen in winter, oak pollen in spring, cottonwood fluff in May and June, and dust kicked up off Highway 377 and the new construction sites along Rufe Snow. Filters fill up faster here than people expect. If you have not changed yours in two months, start there. Pull it out and hold it up to a light. If you cannot see through it, swap it. This five-minute job fixes the issue about 15 percent of the time.
Thermostat issues
Wrong setting, dead batteries, or off calibration. Make sure the thermostat is set to "cool" and not "auto" or "fan only." In fan-only mode, the blower runs but the compressor stays off, so you get airflow without cooling. We get this call ten times a week. Check the temperature setting too. If somebody bumped it up to 80, the system thinks it is already there. Dead batteries on a digital thermostat can shut down the whole system without warning. Swap the batteries, double-check the settings, and give the system 15 minutes to respond before you call us.
Dirty condenser coils
The outdoor unit dumps heat from your home into the surrounding air. When the condenser coils are caked with cottonwood fluff, mowing dust, and grit blown in off Keller's open prairie wind, they cannot shed heat right. The system runs harder, runs longer, and still cannot get the house under 78 on a 100-degree afternoon. This hits hardest in Keller neighborhoods with mature trees, including spots around Old Town Keller, Bear Creek, and the wooded sections of Hidden Lakes. You can hose loose debris off yourself, but a real chemical cleaning of the coils takes a tech. That is part of our standard AC tune-up.
Refrigerant leak
Your system is short on refrigerant. It cools a little but cannot keep pace when Keller hits 105 during a heat wave. The AC runs nonstop, the house stays warm, and your electric bill jumps. Hailstorms across north Tarrant County also bend condenser fins and crack copper lines over time. Brazed joints weaken from thermal cycling. Vibration cracks spread. Slow leaks are common on systems older than 8 years. Adding refrigerant without finding the leak is a quick patch that wastes money. A tech needs to find the leak with electronic detection or nitrogen pressure testing, fix it, then recharge to manufacturer spec. This is a $200 to $400 repair that brings cooling back to full.
Failed capacitor
The most common single-part failure we see. The system tries to start, struggles, and either shuts down or runs at reduced output without full cooling. You may hear clicking, humming, or buzzing from the outdoor unit. Capacitors store the electrical jolt needed to spin up the compressor and fan motors. When they get weak, the motors cannot start cleanly. This is a $150 to $250 fix and we carry capacitors on every truck. Long days of direct Texas sun on outdoor units across Keller wear capacitors out faster than people think. If you hear your outdoor unit straining to start, call us at (817) 945-6320 before the compressor takes damage.
Compressor failure
The big one. The compressor is the heart of the system. It pumps refrigerant between the indoor and outdoor coils. When it dies, you get no cooling at all, or weak cooling with loud grinding or clanking. Compressor swaps run $1,200 to $2,500 depending on the unit. If the system is 10 years old or more, this is usually the point where replacement makes more sense than repair. The compressor alone runs more than a third the price of a new system, and an old unit with a new compressor still has aging wiring, worn coils, and tired duct connections. Call us for an honest read, and if replacement is the better path, see our AC installation page for pricing.
Still warm? Call us now.
If you checked the filter and the thermostat and the house is still hot, you need a tech. We diagnose the problem and quote a price before we touch a thing.
Call (817) 945-6320Free quotes on every job. Fast dispatch. Local Texas techs.
What to try right now before you call
Before you call us, run through these three steps. They take five minutes and fix the problem about 20 percent of the time. First, check the air filter. Pull it out of the return vent and look. If it is gray, matted, or you cannot see light through it, swap it. Put a fresh one in, give the system 30 minutes, and see if cooling picks up.
Second, check the thermostat. Make sure it is set to "cool" and not "fan only" or "auto." Set the target at least 3 degrees below the current room temperature. Replace the batteries on a digital unit. Wait 15 minutes for the system to react.
Third, walk outside and look at the condenser. Is it running? Is it iced over? Any odd noises? If the fan is not spinning but you hear humming, the capacitor is most likely dead. If the unit is iced up, switch the system off and let it thaw for two hours. If none of that fixes it, call us at (817) 945-6320. The other 80 percent calls for a tech with tools and refrigerant. If the situation feels urgent, it may rate as an emergency AC repair.
Quick questions on AC cooling problems
Still warm inside? Call now.
You checked the filter, you checked the thermostat, and nothing changed. Time to bring in a tech. We will have cold air running today.
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