It’s 95 degrees outside and your AC is running — but the air coming out of the vents is warm. In Central Arkansas in the middle of summer, that’s not just uncomfortable, it’s urgent.

Before you call an HVAC tech, there are a few things worth checking yourself. Some causes of warm air are simple fixes that take five minutes. Others require a professional. Here’s how to tell the difference.

Check These First (No Tools Required)

1. Your thermostat is set to “Fan On” instead of “Auto”

This is the most common call HVAC companies get in summer — and it has a one-second fix. When your thermostat fan is set to ON, the blower runs continuously, even when the system isn’t actively cooling. So you get room-temperature air between cooling cycles and it feels warm.

Switch the fan setting from ON to AUTO. The blower will now only run when the system is actually producing cold air.

2. Your air filter is clogged

A dirty air filter restricts airflow so severely that it can cause the evaporator coil to freeze — and a frozen coil can’t cool air. If you haven’t changed your filter in more than 60-90 days (or 30 days if you have pets), check it first.

Turn the system off, swap the filter, and give it 2-3 hours for any ice to thaw before turning it back on. If it starts cooling normally after that, a clogged filter was your culprit.

3. Your outdoor unit is blocked or dirty

Go outside and look at your condenser unit — the big box with the fan on top. If it’s surrounded by overgrown shrubs, caked with cottonwood or debris, or if the fan isn’t spinning when the system is running, airflow is restricted and the system can’t shed heat properly.

Clear at least 2 feet of space around the unit and gently rinse the fins with a garden hose (from the inside out if possible). Don’t use a pressure washer — it bends the fins.

4. A circuit breaker has partially tripped

Your HVAC system runs on two circuits — one for the air handler inside and one for the compressor outside. If the outdoor unit’s breaker has tripped, the indoor blower keeps running but there’s no cooling happening. You get airflow, just no cold air.

Check your breaker panel for any breakers that are in the middle position (not fully on, not fully off). Reset it once. If it trips again immediately, stop — that’s a sign of an electrical problem that needs a pro.

Causes That Require an HVAC Technician

If you’ve checked all of the above and your system is still blowing warm air, the problem is almost certainly one of these:

Low refrigerant (freon leak)

Refrigerant is what actually makes the air cold. If your system is low on refrigerant, it can’t cool effectively — and in Arkansas heat, “not cooling effectively” means warm air pretty quickly.

Low refrigerant almost always means a leak somewhere in the system. Adding more refrigerant without finding and fixing the leak is a temporary patch. A licensed HVAC technician can locate the leak, repair it, and recharge the system properly. This is not a DIY repair — handling refrigerant requires certification.

Failed compressor

The compressor is the heart of your AC system. When it fails, the system runs but produces no cooling at all. You’ll often hear the outdoor unit humming or running with the fan spinning, but no cold air anywhere in the house.

Compressor replacement is one of the more expensive HVAC repairs — typically $1,200–$2,500 depending on the unit — and on older systems it sometimes makes more financial sense to replace the whole unit. A good HVAC tech will give you an honest assessment.

Frozen evaporator coil (beyond a dirty filter)

If the filter was clean but your coil is still freezing, there may be a refrigerant issue, a blower motor problem, or a blocked return air duct causing the freeze. Turn the system off and let it thaw completely (a few hours), then call a technician to diagnose the underlying cause.

Failing capacitor

Capacitors help start and run the motors in your AC system. A failing capacitor often causes the outdoor unit’s compressor or fan to struggle or stop working entirely while the indoor blower keeps running. It’s actually one of the more affordable repairs ($150–$400) but requires a technician to diagnose and replace safely.

A Note on Arkansas Summer Timing

HVAC companies in Conway and Central Arkansas get slammed the moment temperatures hit the 90s — usually late May through late September. Wait times for non-emergency service calls can stretch to several days during peak heat.

If your system is struggling now, before the worst of the summer heat, it’s worth getting it looked at. A system that’s marginal in 85-degree weather tends to fail completely when it’s 100 degrees and working hardest.

Most HVAC companies offer a seasonal tune-up that catches common issues — low refrigerant, dirty coils, failing capacitors — before they become emergency calls. It’s worth scheduling one in May rather than calling for emergency service in August.

When to Call

Call an HVAC technician if:

  • The thermostat, filter, and breaker checks didn’t fix it
  • Your system is freezing up repeatedly
  • The outdoor unit isn’t running at all
  • You hear unusual noises (grinding, screeching, or repeated clicking on startup)
  • Your system is running constantly but the house won’t cool below 80 degrees on a hot day

Browse top-rated HVAC & AC repair companies in Conway & Central Arkansas — ranked by Google review count, with active deals noted where available. Several offer free diagnostic calls or tune-up specials this time of year.