Signs Your AC Needs Repair (and What to Check First)

Carolina summers are hard on air conditioners, and most failures give warning signs before they leave you without cooling. Catching them early usually means a smaller repair. Here's what each common sign typically means, what you can safely check yourself, and when to shut the system off and call.

Warm air from the vents

What it can mean: a dirty filter, a tripped breaker at the outdoor unit, low refrigerant from a leak, or a failing capacitor or compressor.

What to check: confirm the thermostat is on COOL, replace the filter, and go outside. If the indoor fan is running but the outdoor unit is silent, check its breaker. If it trips again after one reset, leave it off and call.

The outdoor unit hums but the fan won't spin

What it can mean: usually a failed capacitor, the part that gives the motors their starting kick. Left running in that condition, the compressor can overheat.

What to do: turn the system off at the thermostat and call. Don't poke at the fan or open the panel. Capacitors hold a dangerous charge even with the power off.

Ice on the refrigerant lines or indoor coil

What it can mean: restricted airflow from a dirty filter or blocked returns, or low refrigerant.

What to do: switch the thermostat from COOL to OFF and set the fan to ON. That melts the ice. Replace the filter. If it freezes again after restarting, it needs a technician.

Water around the indoor unit

What it can mean: a clogged condensate drain line, a cracked drain pan, or a float switch that has shut the system off to prevent an overflow.

What to check: if the system stopped cooling and there's water in the pan, the float switch likely did its job. If your drain line has an access cap, a cup of white vinegar can clear minor buildup. Ongoing leaks, especially from attic units, should be looked at quickly to avoid ceiling damage.

Short cycling

What it can mean: the system turns on and off every few minutes. Causes include a thermostat in a bad spot (like direct sun), a dirty filter, low refrigerant, an electrical problem, or a system that's too big for the house.

Why it matters: short cycling wears out parts quickly and leaves the house humid even when it's cool.

Strange noises or smells

• Squealing or grinding: a motor bearing or a belt is wearing out.
• Banging or rattling: a loose part or something caught in the fan.
• Clicking that never starts the system: often an electrical or control problem.
• Burning or electrical smell: turn the system off at the thermostat and the breaker, and call right away.

Higher bills and a house that never feels dry

A system that runs longer to do the same job costs more every month. Rising bills with no change in habits, or a house that feels clammy at a normal temperature, usually point to a dirty coil, low charge, airflow problems or an aging system.

What we check on an AC repair call

Our technicians test the electrical components, refrigerant charge, airflow, drain and safety controls, find the actual cause, and give you the price before any work is done.