August 2026
Why Your AC is Freezing Up in the August Heat (And What to Do)
It is the middle of August in the Wabash Valley. The humidity is through the roof, your house is starting to feel uncomfortably warm, and when you go outside to check your air conditioner, you see something that makes zero sense: your AC unit is covered in ice.
A frozen air conditioner in 90-degree weather is enough to send any Terre Haute homeowner into a panic. Your first thought might be that the entire system is dead and you are about to face a massive replacement bill.
At Roehm Refrigeration Heating & Cooling, we want you to take a deep breath. As a family-operated and proudly 100% women-owned business, our goal is to give you honest answers, not a high-pressure sales pitch. Before you assume the worst, here is exactly why your AC freezes up and the steps you should take right now.
Why Does an Air Conditioner Freeze in the Summer?
Your air conditioner doesn’t actually “create” cold air; it removes heat from your home. It does this by blowing warm indoor air over freezing cold evaporator coils.
If everything is working properly, the warm air keeps the cold coils from freezing over. But if that airflow is restricted, or if the system doesn’t have enough refrigerant to absorb the heat, the temperature of those coils drops below freezing. The thick Indiana summer humidity then hits those freezing coils, turns to condensation, and instantly freezes.
Do This Before You Call Us
Some corporate HVAC companies love a frozen AC call because it’s an easy opportunity to try and sell you a brand-new system. We do things differently. We want to save you money.
Before you pick up the phone for a service call, do these three things:
- Turn the AC OFF immediately. Do not keep running a frozen air conditioner! Your compressor is the heart of your system, and trying to force it to pump through a block of ice will burn it out. Turn the thermostat from “Cool” to “Off,” and turn the fan setting from “Auto” to “On.” This will force warm air over the indoor coils and speed up the melting process.
- Check your air filter. This is the #1 cause of a frozen AC. A clogged, dirty filter suffocates your system. Without warm air flowing over the coils, they freeze solid. If your filter looks like a gray blanket of dust, throw it out and put a new one in. (This simple fix resolves a huge percentage of frozen AC calls!).
- Check your vents. Make sure furniture or rugs aren’t blocking your return vents, and ensure your supply vents are open. Closing too many vents to “save energy” actually restricts airflow and can freeze your system.
When Is It Time to Call the Professionals?
If you have changed the filter, opened the vents, let the ice completely melt, and the system still freezes up when you turn it back on, you have a mechanical issue.
You likely have a refrigerant leak or a failing blower motor. Because refrigerant systems are pressurized and involve chemical handling, this is where DIY stops and professional help is required.
If you find yourself in this situation, you need fast, reliable AC repair in Terre Haute.
Schedule Service Today
Honest Service You Can Trust
Since 1947, Roehm Refrigeration Heating & Cooling has been dedicated to fixing the problem right the first time without the corporate up-sells. If you are dealing with a stubborn, freezing air conditioner this August, give us a call. Our NATE-certified technicians will diagnose the true cause of the problem and give you a transparent, gimmick-free estimate to get your home comfortable again.