Living in Houston, you know what to expect when the summer months roll around: temperatures will reach triple digits, humidity will climb, and you’ll spend more time indoors to stay safe and comfortable.
Few things can be as frustrating as coming home to a hot, stuffy house… and it only gets worse when you realize your AC is blowing warm air around your home.
When your air conditioner stops cooling properly, it’s easy to assume the worst. But while some issues require professional repairs, many cases of warm air can be traced back to common problems. Let’s discuss some of the most common reasons your AC might blow warm air in Houston.
Incorrect Thermostat Settings
One of the most common issues we see is incorrect thermostat settings. Sometimes, this means setting the temperature to the right temperature without actually switching from ‘heating’ to ‘cooling’; in other cases, the thermostat may be set to “Fan” instead of “Auto,” causing the system to circulate air throughout the home even when the air conditioner isn’t actively cooling.
Before assuming you’re dealing with a major air conditioning problem, be sure to check for thermostat issues; even changing the batteries can impact your air conditioner. If everything looks right, you’re likely dealing with a problem elsewhere in the system.
Dirty Air Filters
Air conditioners use filters to pull dust, dirt, pet dander, and other airborne contaminants out of the air supply so they’re not redistributed throughout your home whenever the AC runs. They play a crucial role in maintaining the overall comfort and safety of your home.
With usage, though, air filters can become clogged. When this happens, airflow becomes restricted, making it harder for your air conditioner to move enough air across the evaporator coil. This can cause your AC to freeze over, eventually leading to the system blowing warm air, rather than the cool air you expect.
The good news is that replacing dirty, clogged air filters is one of the easiest ways to resolve an AC blowing hot air. Check your air filter regularly and replace it according to the manufacturer’s recommendations, typically every one to three months depending on usage.
Refrigerant Leaks
Your air conditioner uses refrigerant to remove warm air from the home and release it outdoors. Because it’s a closed-loop system, you should never run out of refrigerant; the only way you would is if a leak is present.
To check for a refrigerant leak, start by looking for common warning signs. Ice buildup on the refrigerant lines, hissing sounds near the indoor or outdoor unit, longer cooling cycles, and warm air coming from the vents can all indicate low refrigerant levels.
If your AC unit is dealing with a refrigerant leak, call on a professional technician to provide you with the AC repair you need.
Electrical Issues
Air conditioning systems have wires, connections, and electrical components that all work together to power the indoor unit and outdoor unit. Electrical issues can cause an AC to blow warm air if the circuit breaker trips; your outdoor condenser will lose power, but the system may still push air through the vents. Because the condenser has no power, the air you feel coming through the vents will be lukewarm.
Because electrical components carry safety risks and can be difficult to diagnose without the proper tools, it’s best to leave inspections and repairs to a qualified HVAC technician. Attempting DIY electrical repairs can result in injury or further damage to your system.
Faulty Capacitor
Capacitors play an important role in the cooling process; AC systems use them to provide the electrical boost needed to start and run key components like the compressor and fan motors.
When a capacitor begins to fail, your cooling system may struggle to start or operate properly. In some cases, the indoor unit will continue circulating air while the outdoor unit fails to turn on, resulting in warm air coming from the vents instead of cool air.
Broken Blower Motor
The blower motor is responsible for pushing conditioned air through your ductwork and into your living spaces. If the blower motor fails or begins malfunctioning, your AC may struggle to distribute cool air throughout the home, making it seem like the system isn’t cooling at all.
In some cases, a failing blower motor can reduce airflow so significantly that rooms feel warm and uncomfortable despite the air conditioner running.
Troubleshooting Tips
AC problems are stressful, and troubleshooting them on your own can be overwhelming if you’re not sure what to look for. Before scheduling an AC repair, try these simple checks:
- Verify your thermostat is set to “Cool” and that the temperature setting is lower than your home’s current temperature.
- Check that the thermostat fan setting is on “Auto” rather than “On.”
- Replace a dirty or clogged air filter if it’s been more than a few months since the last replacement.
- Inspect your circuit breaker panel for any tripped breakers related to your HVAC system.
- Make sure the outdoor condenser unit is running and isn’t blocked by debris, overgrown vegetation, or other obstructions.
- Look for signs of ice buildup on refrigerant lines or the indoor unit.
- Listen for unusual sounds such as buzzing, humming, clicking, or hissing, which can indicate electrical or refrigerant issues.
- Check that all supply vents throughout your home are open and unobstructed.
Schedule AC Services in Houston, TX
The comfort and safety of your home should never be compromised. At House Pro Air Conditioning, we provide comprehensive air conditioning services in Houston, TX, including AC repair, installation, replacement, and maintenance.
Whether you need to replace a dirty filter, repair electrical issues, or restore proper airflow, House Pro has the tools and team to get the job done right. Give us a call or contact us online today for a complete range of AC services in Houston!