AC Not Cooling
When your AC stops cooling in a Nashville summer, indoor temperatures can reach dangerous levels within hours. Before you panic, some causes have simple fixes. Here is what to check, what to try, and when to call for emergency service.
Call (615) 420-7082 — 24/7 EmergencyImmediate Steps When Your AC Stops Cooling
Check your thermostat first. Verify that it is set to cool mode, that the set temperature is below the current room temperature, and that the fan is set to auto. If the display is blank, replace the batteries. Inspect your air filter next. A severely clogged filter restricts airflow to the point where the evaporator coil freezes over, blocking all cooling. If the filter is visibly dirty, replace it and give the system 30 minutes with the AC off but the fan set to on to thaw the coil. Check the outdoor condenser unit to verify it is running. If the fan is not spinning, check the disconnect switch and the breaker. Look for obstructions like grass clippings, leaves, and cottonwood seeds that clog the condenser coil. If ice is visible on the refrigerant lines, you likely have a frozen evaporator coil. Turn the system off completely and let it thaw for two to four hours before restarting.
Common Causes of AC Failure in Nashville
Refrigerant leaks are the most common cause of gradual cooling loss. Refrigerant does not get used up. If your system is low, it has a leak that must be located and repaired. Capacitor failure is the most common cause of sudden AC breakdown in Nashville. The extreme heat accelerates capacitor degradation, and a failed capacitor prevents the compressor or fan motor from starting. Compressor failure is the most serious mechanical AC problem and is often expensive enough that replacement of the entire outdoor unit makes more financial sense. Contactor failure prevents the outdoor unit from receiving electrical power. Condensate drain clogs are common in Nashville due to high humidity and can trigger a safety float switch that shuts down the system. Thermostat failures, wiring problems, and control board malfunctions round out the common causes.
When to Call for Emergency AC Service
Call for emergency service if indoor temperatures exceed 85 degrees and continue rising, especially with elderly family members, infants, or pets in the home. A burning smell from your AC system is always an emergency as it could indicate an electrical problem or fire risk. Turn off the system immediately. Hissing or bubbling sounds combined with sudden cooling loss suggest a refrigerant leak. Water actively leaking from your indoor unit needs prompt attention to prevent ceiling, wall, and flooring damage. If your AC has completely stopped and basic troubleshooting has not resolved the issue, professional diagnosis is needed. In Nashville summer heat, a home without AC will reach uncomfortable temperatures within two to four hours and potentially dangerous temperatures within six to eight hours on the hottest days.
Frequently Asked Questions
Why is my AC running but not cooling?
The most common causes are low refrigerant from a leak, a frozen evaporator coil, a dirty condenser unit, a failed compressor capacitor, or a malfunctioning thermostat. Check your filter and thermostat first, then call for professional diagnosis if the issue persists.
How much does emergency AC repair cost?
Emergency AC repairs typically include a diagnostic fee of $89 to $150 plus repair costs. Common repairs like capacitor replacement run $200 to $350 total. We provide complete pricing before starting any work.
Can I run my AC after the coil freezes?
No. Running the AC with a frozen coil can damage the compressor. Turn the AC off, set the fan to on to help thaw the coil for 2 to 4 hours, replace the filter, and restart. If it freezes again, you need professional service.
Need Emergency Help Now?
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