Lifestyle

5 Signs Your Air Conditioner Needs a Service Call Before It Fails

By Erica Coleman · July 5, 2026

Your air conditioner works hardest in July and August. It is also most likely to fail during peak demand — which means the system that struggles in late June is the system that dies in mid-July when every HVAC company is booked out two weeks.

1. The air coming from the vents feels warm or barely cool

An air conditioner blowing room-temperature air when it should be cooling indicates a refrigerant leak, a failing compressor, or a frozen evaporator coil. All three get worse with continued use. Running a system with low refrigerant accelerates compressor wear — turning a $300 refrigerant recharge into a $2,000 compressor replacement.

2. The system turns on and off every few minutes

Short cycling — the system starting, running briefly, shutting off, and restarting in rapid succession — is one of the most damaging patterns for an AC system. The startup phase places the most mechanical stress on the compressor. Repeated startups in rapid succession can destroy a compressor in weeks. Common causes include a clogged filter, a refrigerant issue, or an oversized system.

3. Strange sounds when the system runs

Grinding, banging, squealing, or rattling sounds indicate mechanical problems — a failing motor bearing, a loose component, a worn belt, or debris inside the outdoor unit. A properly functioning system should be relatively quiet. New sounds that weren’t present last month warrant a call.

4. Your electricity bill spiked without explanation

The Department of Energy estimates that heating and cooling account for roughly 43% of residential energy costs. If your electricity bill jumped 15-20% compared to the same month last year and you haven’t changed your usage habits, your AC system is likely working significantly harder than it should. That inefficiency is both a cost and a warning.

5. Water is pooling around the indoor unit

Water near the indoor air handler — on the floor, on the drain pan, or around the base — indicates a clogged condensate drain line or a frozen evaporator coil that is thawing and overflowing. A clogged drain is a $100 fix. The water damage it causes to flooring, drywall, and subflooring if left unaddressed can cost thousands.

The average lifespan of a central AC system is 15 to 20 years. If yours is over 12 years old and showing any of these signs, a $150 service call now is the cheapest option available to you. The expensive option is waiting until it fails on the hottest day of the year.