Air conditioning services in O'Fallon, MO

The AC runs but the air isn't cold

Usually a clogged filter choking airflow, low refrigerant from a leak, a dirty outdoor coil, or a thermostat set to the wrong mode. Check the filter and thermostat first; refrigerant work is federally regulated and needs a certified technician.

Ice on the indoor coil or the copper lines

Restricted airflow or low refrigerant. Shut the system off so the ice can melt before anyone works on it — running a frozen system can damage the compressor, which is the most expensive part of the unit.

The outdoor unit hums but the fan doesn't spin

Commonly a failed run capacitor or contactor. Both are wear parts, both are inexpensive compared with the compressor they protect, and both are same-visit repairs when we have the part on the truck.

The system turns on and off every few minutes

Short cycling. It can mean an oversized system, a dirty filter, low refrigerant, or a failing control. It matters because short cycles never run long enough to pull humidity out of the air, which is why a house can read 72 degrees and still feel sticky in a Missouri August.

Water around the indoor unit

A blocked condensate drain, a cracked drain pan, or a frozen coil that has thawed. It is worth calling promptly — condensate leaks damage drywall and flooring long before they damage the AC.

The AC is loud, rattling, or screeching

Loose hardware, a failing blower or condenser fan motor, or a compressor under strain. Noise that is new is worth a diagnosis; noise that is sudden and loud is worth shutting the system off first.

Some rooms cool and others never do

Usually a duct or airflow problem rather than a broken AC — undersized returns, leaking duct runs, closed dampers, or a system sized for a house that has since been added onto. A room-by-room airflow check finds it.

Cooling bills climbing with no change in habits

Falling efficiency: a dirty coil, low refrigerant, a failing capacitor making the compressor work harder, or an aging system nearing the end of its service life. A tune-up separates a cheap fix from a replacement conversation.

If the house is already too hot to wait, emergency AC repair is available 24/7. If it's running but struggling, a standard AC repair visit is the right call.

• AC repair and diagnostics

  Capacitors, contactors, fan and blower motors, control boards, thermostats, refrigerant leak detection and repair, frozen coils, condensate drains, and electrical faults on central air conditioners and heat pumps in cooling mode.

• Emergency AC repair, 24/7

  Nights, weekends, and holidays. When a house loses cooling in a Missouri heat wave — especially with infants, older adults, or anyone with a health condition at home — that is an emergency and we treat it as one.

• AC replacement and installation

  Load-calculated sizing rather than swapping like-for-like, matched indoor and outdoor equipment, correct line-set and refrigerant handling, permits pulled where the jurisdiction requires them, and old equipment hauled away.

• AC maintenance and tune-ups

  Coil cleaning, charge verification, electrical and capacitor testing, drain clearing, filter service, and airflow checks — the visit that catches a failing part in May instead of the first 95-degree afternoon.

• Ductless mini-split systems

  Cooling for additions, finished basements, sunrooms, garages, and older homes with no ductwork, sized per zone rather than per house.

• Heat pumps and dual-fuel systems

  One system that cools in summer and heats efficiently through most of a St. Louis-metro winter, with a gas furnace underneath for the coldest stretches.

• Airflow and duct troubleshooting

  Room-to-room temperature differences, weak returns, and leaking or undersized duct runs — the reason a correctly working AC can still leave an upstairs bedroom hot.

• Indoor air quality with cooling

  Filtration, humidity control, and ventilation matched to the blower the house actually has, because humidity is half of what makes a Missouri summer uncomfortable.