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AC Repair · Chattanooga, TN

AC Repair in Chattanooga, TN

When the AC quits on a muggy July afternoon in the Tennessee Valley, the house heats up fast. A few safe checks can narrow down the problem before the technician arrives.

  • AC and heat pump repairs, replacements and new systems
  • Chattanooga, the ridges and North Georgia
  • Get a quote before any work starts

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Check the settings

The thermostat should read Cool, with the setpoint below the room temperature and the fan on Auto. A blank or flickering screen often just needs new batteries. Wait several minutes after any change, because many systems have a built-in delay before restarting.

Power to both units

There are usually two breakers, one for the outdoor condenser and one for the indoor air handler or furnace, plus a disconnect box beside the outdoor unit. If a breaker has tripped, reset it once. If it trips again, leave it off and book a repair.

Diagram: the outdoor disconnect box sits on the wall beside the condenser and must be on for it to run.
Diagram: the outdoor disconnect box sits on the wall beside the condenser and must be on for it to run.

Look at the filter

A clogged filter cuts airflow so badly that the indoor coil can freeze. Then the house barely cools no matter how long the system runs. Replace it and give the coil time to thaw.

Diagram: the filter slides into the air handler or sits behind a return grille, arrow toward the unit.
Diagram: the filter slides into the air handler or sits behind a return grille, arrow toward the unit.

Frozen lines

Ice on the copper line at the outdoor unit or on the indoor coil means turn cooling off and run the fan only for a few hours. If it freezes again with a clean filter, there's likely a refrigerant or airflow fault.

Leaks and float switches

On humid days the coil pulls a lot of water from the air. A blocked condensate line can fill the pan and trip a float switch, which shuts the AC off to protect your floors and ceilings.

Diagram: condensate drains from the pan through a pipe; a float switch can stop the AC if the pan fills.
Diagram: condensate drains from the pan through a pipe; a float switch can stop the AC if the pan fills.

Noises and smells

Buzzing without the fan turning, clicking, grinding or a burning smell all need a technician. Common culprits are capacitors, contactors and fan motors, which work hardest in peak heat.

Systems in crawl spaces

Many Chattanooga homes have the air handler or ducts in a crawl space. Water, pests or a disconnected duct down there can cause poor cooling that you can't see from inside the house.

Help the diagnosis

Note the system's age, what it's doing, when it started and anything you've checked. Send a request and an AC company will get in touch.

Technician repairing an outdoor air conditioner

Frequently asked questions

Why does my AC run constantly on hot afternoons?
On days in the mid-90s an older or undersized system may run nonstop and still lag a few degrees. If it never catches up, even overnight, have it checked for low refrigerant, dirty coils or duct leaks.
Is it safe to keep resetting the breaker?
No. One reset is fine, but a breaker that trips again is protecting the equipment from an electrical problem.

Other air conditioning and heating services

AC ReplacementRight-sized systems for valley heat and humidity.Heat PumpsYear-round comfort for a mild-winter climate.Furnace RepairNo heat, short cycling and fall checks.AC MaintenanceSpring tune-ups before the heat sets in.ThermostatsSmart thermostats for heat pumps and dual fuel.Ductwork & AirflowSealing and balancing for uneven rooms.Crawl Space & HumidityDamp crawl spaces and musty air.

Need ac repair in Chattanooga?

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Request an AC technician
Request an AC technician