There is nothing quite as frustrating as turning on your air conditioner on a hot Hesperia afternoon only to feel warm air blowing from the vents. Before you panic, know that some causes are simple and easy to fix. In this article, we will walk through the most common reasons your AC is blowing warm air and when it is time to call a professional.
1. Thermostat Settings
It sounds obvious, but the first thing to check is your thermostat. Make sure it is set to "cool" mode and the temperature is set below the current room temperature. Also check that the fan is set to "auto" rather than "on." When the fan is set to "on," it will blow continuously even when the cooling cycle is not running, which can make the air feel warm.
2. Dirty Air Filter
A clogged air filter restricts airflow across the evaporator coils, which can cause the coils to freeze up. When this happens, the system cannot properly cool the air, and you may feel warm air coming from the vents. In Hesperia's dusty desert environment, filters clog faster than in other climates. Check your filter and replace it if it looks dirty.
3. Refrigerant Leak
Refrigerant is the substance that absorbs heat from inside your home and releases it outside. If your system has a refrigerant leak, it cannot effectively cool your home. Signs of a refrigerant leak include ice buildup on the refrigerant lines, hissing sounds near the outdoor unit, and gradually decreasing cooling performance. Refrigerant issues require professional repair.
4. Dirty Condenser Coils
The outdoor condenser unit releases heat from your home into the outside air. When the coils become covered in dirt, dust, and debris, they cannot release heat efficiently. This reduces cooling capacity and can cause warm air to blow indoors. Keeping the area around your outdoor unit clear and having the coils professionally cleaned can solve this issue.
5. Electrical Issues
Your AC has multiple electrical components that must work together. If the compressor or outdoor fan motor is not receiving power, the indoor fan may still run and blow air, but it will not be cooled. Check your breaker panel to see if any breakers have tripped. If resetting the breaker does not solve the problem, there may be a more serious electrical issue that requires professional attention.
6. Ductwork Problems
If your ductwork has leaks or disconnected sections in unconditioned spaces like attics, the cooled air can escape before reaching your rooms. Meanwhile, hot attic air can be pulled into the ducts and blown into your home. Duct sealing and insulation can dramatically improve your cooling efficiency and comfort.
When to Call a Professional
If you have checked the thermostat and filter and your AC is still blowing warm air, it is time to call Desert Breeze Heating & Air. Our technicians can quickly diagnose the issue and get your cooling restored. We serve Hesperia, Victorville, Apple Valley, and surrounding areas with same-day service and fairly priced repairs with no hidden costs.