It’s frustrating when you turn on your AC during a hot day in North Central Ohio, but only get warm air. This is not a minor inconvenience but a flaw that needs prompt attention to prevent further system damage. Causes can range from dirty filters and incorrect thermostat settings to low refrigerant and compressor issues.
Here’s a quick guide to why your cooling system is blowing hot air and what you can do.
Low Refrigerant Levels
Refrigerant is a highly volatile chemical compound with unique thermodynamic properties that allow it to absorb and release heat quickly. It passes through the evaporator coils inside, where it collects heat. It then travels to the condenser coils outside, where it releases heat.
When the refrigerant levels drop below the required level, the system loses its ability to adequately transfer heat. So, the air that circulates back into your rooms feels warm or only slightly cooler than the indoor temperature. While it may seem counterintuitive, low refrigerant often causes the coils to freeze. The reduced refrigerant pressure lowers the coil temperature, allowing moisture in the air to freeze on its surface, further inhibiting heat transfer.
Clogged Air Filters
Your air conditioning system depends on a steady, unobstructed flow of air to cool your home effectively. When the air filter becomes clogged with dust and debris, the airflow is significantly reduced. The system must work harder to pull air across the evaporator coil. The restricted airflow prevents the coil from absorbing heat the way it should.
The refrigerant flowing through these coils is very cold and ready to absorb the heat from the indoor air. When a clogged filter blocks that airflow, the coils quickly drop below freezing. Moisture in the surrounding air settles on the coil and turns to ice, forming a layer that thickens over time, further impeding heat transfer.
Check the filter, and if it’s dirty, change it. If the filter was dirty and the coils froze, leave the system off or set to fan-only for a while. With the new filter in place and the coils thawed, see if cooling capacity is restored.
Wrong Thermostat Settings
Your AC may be blowing warm air simply because the thermostat settings are incorrect. If the Fan is set to On instead of Auto, the system will circulate air throughout the home even when it’s not actively cooling. It’s also possible that the system was set to Heat, or the temperature was accidentally set too high.
If you have a programmable or smart thermostat, make sure it’s not set to your “away” or “vacation” mode. Additionally, storms and power interruptions can reset the thermostat and erase your settings.
Malfunctions in the thermostat or sensors can interfere with accurate readings. Dust buildup, weak batteries, or loose wiring can cause the device to behave unpredictably.
After checking and correcting any setting issues and changing batteries if necessary, try running the AC again. If it still doesn’t cool properly, it will require professional repairs.
Outside Unit Is Failing
When the condenser begins to lose power or malfunction, the cooling cycle breaks down even though the indoor blower continues to run. The outdoor unit is responsible for releasing the heat collected from inside your home. If it cannot operate correctly, the system has no way to expel that heat. As a result, the air returning through your vents feels warm or only slightly cool.
What You Can Do
If changing the air filter or correcting thermostat settings did not restore cooling, it’s time to call a licensed technician. North Central Ohio summers cause cooling systems to run longer and more frequently. Even minor problems can escalate quickly when equipment runs for long hours in high heat.
Contact Comfort Control for Professional Assistance in Ashland
If you’re in Ashland, Wellington, or a neighboring community, our NATE-certified technicians are available 24/7 to help with your AC troubles. With over 45 years of industry experience and an A+ BBB rating, we have a long record of dependable service. Our team can accurately diagnose why your system is blowing warm air and quickly perform AC repair to restore your home’s comfort.
Contact us at Comfort Control today for dependable AC repair in Ashland or Wellington, OH.
