AC Running But Not Cooling

“My AC runs constantly but the house won't get below 80°F”

When an AC runs without cooling, low refrigerant is the first thing to check — the system can't transfer heat without the right charge. Efrain also inspects the condenser coil for blockage and the evaporator for ice buildup, both of which can mimic refrigerant symptoms. Most central AC systems in Rockville homes take 30–45 minutes to diagnose.

“The air from my vents feels like room temperature, not cold”

Warm or room-temperature air from a running system almost always means a frozen evaporator coil or critically low refrigerant. A frozen coil needs the system off for a few hours to thaw — running it longer only risks compressor damage. Call before the problem compounds.

“My outdoor unit is making a grinding noise and the house won't cool”

A grinding condenser could be a worn fan motor bearing or a failing compressor. The fan motor is a $150–$300 part. The compressor is $800–$2,000 — and on systems over 12 years old, that math often favors replacement. Efrain gives you an honest cost comparison before any work starts.

“I replaced the thermostat but the AC still won't cool down”

Thermostats almost never cause cooling failures — they just relay a signal. The problem is almost always in the system itself: low refrigerant, a failed capacitor, a tripped contactor, or dirty coils. Efrain runs a full diagnostic rather than swapping components one at a time, which saves you both time and money.

“My AC worked fine in May but stopped keeping up when it got hot in July”

A marginal refrigerant charge or borderline capacitor can handle 75°F days but fail under 95°F peak demand. Rockville summers peak in July — that's when marginal systems fail. A pre-season or early-season diagnostic catches it before the hottest week of the year.