Why Is My AC Blowing Warm Air? Common Summer HVAC Issues in Lexington, SC

June 30, 2025

When summer hits Lexington, SC, the heat and humidity can be relentless—and the last thing you want is your air conditioner blowing warm air. At Brian’s Heating & Cooling, we hear this complaint all too often during peak summer months. If your AC isn’t keeping your home cool and comfortable, there could be several common issues at play. Let’s break down the most frequent reasons your AC might be blowing warm air—and what you can do about it.


1. Your Thermostat Is Set Incorrectly

It may sound obvious, but we always start here. If your thermostat is accidentally set to “heat” instead of “cool”, your AC will blow warm air. Double-check the settings, and make sure the fan is set to “auto” instead of “on” (which can circulate warm air when the system isn’t actively cooling).


2. Refrigerant Levels Are Low or Leaking

Refrigerant is the substance your AC uses to absorb heat and cool your home. If your system is low on refrigerant—or if there’s a leak—your AC won’t be able to cool properly. This is not a DIY fix. Call a licensed HVAC technician in Lexington to inspect and recharge the system if needed.


Pro Tip: Refrigerant issues often come with other symptoms like hissing noises, ice buildup on the coils, or reduced airflow.


3. Dirty or Clogged Air Filters

A dirty air filter restricts airflow, causing your system to work harder and potentially overheat. When this happens, the system may blow warm or room-temperature air. We recommend replacing your air filter every 1–3 months, especially during the summer when your AC runs constantly in Lexington’s high humidity.


4. Electrical Issues or Blown Fuses

Sometimes, the indoor unit is working, but the outdoor condenser isn’t. This can happen due to a tripped breaker or a blown fuse. If the outdoor unit isn’t running, the system can't complete the cooling cycle—leaving you with warm air. A quick inspection of your circuit breaker panel may reveal the problem. If a fuse has blown or a breaker continues to trip, it's time to call an HVAC professional.


5. Frozen Evaporator Coils

Ironically, frozen coils can cause warm air. When the evaporator coil freezes, it can’t absorb heat properly, which interrupts the cooling process.

This can be caused by low refrigerant, dirty filters, or blocked airflow. If you notice ice forming on your AC unit, shut it off and contact our Lexington HVAC team right away.


6. A Faulty Compressor

The compressor is the heart of your AC system, pumping refrigerant between the indoor and outdoor units. If the compressor fails, your system can’t cool at all. This is a serious issue that usually requires professional repair or replacement.


7. Poor Maintenance or Lack of Seasonal Tune-Ups

Regular HVAC maintenance is essential in Lexington, SC, where AC systems are under constant stress during hot summers. Neglected systems are more prone to breakdowns, warm airflow, and costly repairs. At Brian’s Heating & Cooling, we offer affordable maintenance plans to keep your system running at peak performance year-round. Check out our maintenance service page to learn more!


What Should You Do if Your AC Is Blowing Warm Air?

  • Check the thermostat settings.
  • Inspect your air filter.
  • Ensure the outdoor unit is running.
  • Call a trusted local HVAC company in Lexington, SC.


Trust Brian’s Heating & Cooling for Fast, Reliable AC Repairs in Lexington, SC

When your AC is blowing warm air in the middle of a South Carolina summer, don’t wait. At Brian’s Heating & Cooling, we’ve been serving the Lexington community for years with fast, honest, and affordable HVAC service. Whether it’s a refrigerant leak, a dirty coil, or a faulty thermostat, our certified technicians will diagnose and fix the problem quickly—so you can get back to enjoying a cool, comfortable home.


📞 Call us today at 803-796-1788

Is Your AC Ready for the Lexington Summer? Here’s a Quick Checklist

May 29, 2025
Summer in Lexington, SC can be brutally hot and humid — and the last thing you want is for your air conditioner to fail just when you need it most. At Brian’s Heating & Cooling, we want to help you stay cool and comfortable all summer long. Here’s a quick checklist to make sure your AC is ready for the South Carolina heat. ✅ 1. Check and Replace Your Air Filter One of the easiest — and most important — things you can do is replace your HVAC filter regularly. A dirty filter restricts airflow, reduces efficiency, and can put unnecessary strain on your system. We recommend checking your filter every month and replacing it at least every 60–90 days. ✅ 2. Inspect Your Thermostat Make sure your thermostat is working properly and set to “cool.” If you’re still using an older manual thermostat, consider upgrading to a programmable or smart thermostat to save energy and improve comfort. ✅ 3. Clear Debris Around the Outdoor Unit Your outdoor AC unit needs room to breathe. Clear away leaves, grass clippings, and any other debris within a two-foot radius. Trim back any bushes or shrubs that may be too close to the unit. ✅ 4. Check Air Vents and Registers Walk through your home and make sure all vents are open and unobstructed. Blocked vents can lead to uneven cooling and increased energy bills. ✅ 5. Listen for Strange Noises If your AC is making unusual sounds like banging, grinding, or squealing, that could be a sign something is wrong. Don’t wait — schedule a service call with our team before a small issue turns into a major repair. ✅ 6. Test the System Before Peak Heat Turn your system on before the hottest days arrive to make sure it’s cooling properly. If you notice weak airflow, warm air, or the system isn’t turning on at all, give us a call right away. ✅ 7. Schedule a Professional AC Tune-Up An annual maintenance check from Brian’s Heating & Cooling can extend the life of your system, improve efficiency, and catch small problems before they become big headaches. Our AC tune-ups include a full inspection, refrigerant check, coil cleaning, and more. Don’t Wait Until It’s Too Late — Call Brian’s Heating & Cooling Today! Whether you need a quick repair, routine maintenance, or a full AC replacement, Brian’s Heating & Cooling is here to keep Lexington homes cool and comfortable all summer long. Give us a call at 803-796-1788 or schedule your AC tune-up online today! 📍 Proudly serving Lexington, SC and the surrounding communities with expert HVAC service.

Why Mid-Spring Is the Perfect Time to Upgrade Your Thermostat in Lexington, SC

April 30, 2025
As Lexington temperatures start warming up in mid-spring, it's a great time to take a look at one of the most overlooked parts of your HVAC system—your thermostat. Upgrading to a smart thermostat now can help you save energy, improve comfort, and prepare for the summer heat. At Brian's Heating & Cooling, we’re here to help you get the most out of your home’s climate control. Benefits of Upgrading Your Thermostat in the Spring Lower Energy Bills All Season Long Smart thermostats automatically learn your schedule and adjust your HVAC usage to save energy. By upgrading now, you'll maximize savings through the hottest months of the year. Greater Comfort and Control Whether you're home or away, smart thermostats give you remote access from your phone. You can adjust your home's temperature on the go and make sure it’s always just right when you arrive. Catch Issues Before Summer Arrives If your current thermostat isn’t working as it should—like not maintaining temperature or causing frequent cycling—it can lead to stress on your HVAC system. Upgrading now helps avoid unexpected breakdowns when you need cool air the most. Easy Integration with Smart Home Systems Spring is a great time for home improvement projects, and upgrading your thermostat is a simple step toward a smarter home. Many smart thermostats integrate seamlessly with voice assistants and other smart devices. Trust Brian’s Heating & Cooling for a Seamless Upgrade Our expert team can recommend and install the best thermostat for your home, whether you're looking for simple energy savings or full smart home integration. We’ll walk you through the features and ensure it works perfectly with your current HVAC system. Ready to upgrade your comfort this spring? Call Brian’s Heating & Cooling today to schedule your thermostat installation in Lexington, SC. Let’s get your home ready for a cool, energy-efficient summer! Check out our thermostat product page to learn more about some of the smart thermostats we carry and install here at Brian's Heating & Cooling in Lexington, SC.

Preparing Your HVAC System for Spring: Essential Tips

March 13, 2025
As the weather starts to warm up, it’s the perfect time to prepare your HVAC system for the upcoming spring season. At Brian’s Heating & Cooling, we understand how crucial it is to ensure your HVAC system is running smoothly as you transition from chilly winter temperatures to the comfort of warmer spring days. Here are some essential tips to get your HVAC system ready for the season: 1. Replace Your Air Filters Dirty air filters are one of the most common causes of HVAC inefficiency. As your system works harder during the changing seasons, it’s vital to replace the air filters to improve airflow and indoor air quality. This simple task can also reduce strain on your system and help avoid costly repairs down the line. 2. Check Your Thermostat Spring means fluctuating temperatures, so make sure your thermostat is working properly. Test it by setting it a few degrees higher than your current temperature to ensure it’s maintaining a comfortable level. Consider upgrading to a smart thermostat for better energy efficiency and easier control of your home’s temperature. 3. Clean and Inspect Vents and Ductwork Dust, debris, and allergens can accumulate in your ducts over time, affecting your system’s performance. Make sure to clean all vents and inspect your ductwork for any leaks or blockages. If necessary, schedule a professional duct cleaning to ensure that air flows freely throughout your home. 4. Schedule a Professional HVAC Tune-Up Spring is the ideal time to schedule a professional HVAC tune-up. A certified technician can inspect your system for potential issues, clean key components, and perform necessary maintenance to keep your system running efficiently throughout the season. Regular tune-ups can extend the life of your HVAC system and prevent unexpected breakdowns. 5. Test Your AC System Before the hot summer months hit, it’s important to test your air conditioning system. Turn it on to ensure it’s cooling your home effectively. If you notice any strange noises, poor airflow, or insufficient cooling, call a professional to inspect and repair your AC system before the summer heat sets in. 6. Clear the Area Around Your Outdoor Unit Your outdoor unit is just as important as the one inside. Ensure that the area around your outdoor condenser unit is free of debris like leaves, dirt, and branches. Proper airflow is essential for the efficiency of the system, and clearing the area helps your system run at its best. 7. Check Insulation and Seal Leaks Proper insulation helps keep your home at a comfortable temperature without overworking your HVAC system. Check areas like windows, doors, and attics for any leaks or gaps. Sealing these cracks helps prevent energy loss and lowers your energy bills while maintaining your home’s comfort. 8. Consider Upgrading Your HVAC System If your HVAC system is aging or you’ve noticed a significant drop in performance, spring may be the perfect time to consider an upgrade. Newer models are more energy-efficient, quieter, and offer better cooling and heating capabilities, which can save you money in the long run. Check out our products page to learn more about our energy-efficient heating and air conditioning equipment we carry and install here at Brian's Heating & Cooling. By taking the time to prepare your HVAC system for spring, you’ll not only improve your home’s comfort but also increase your system’s longevity and efficiency. At Brian’s Heating & Cooling, we’re committed to helping you get your HVAC system ready for the warmer months. If you need any assistance or professional maintenance, don’t hesitate to reach out to us. Stay cool, comfortable, and prepared for spring!