Common Heating & Air Conditioning Questions & Answers

If you’ve recently turned on your air conditioner and noticed a strange smell, you’re not alone. Every spring, homeowners in Lexington, SC start up their AC systems for the first time in months—and quickly realize something doesn’t smell right. At Brian’s Heating & Cooling, we get frequent calls this time of year about AC odors, and while some are harmless, others can point to bigger HVAC issues. Here’s what those smells mean—and when it’s time to call for AC repair in Lexington, SC. Why Does My AC Smell When I Turn It On? When your air conditioner sits unused during the winter, dust, moisture, and even bacteria can build up inside the system. Once you turn it back on in the spring, those odors get pushed through your vents and into your home. In Lexington’s humid climate, this buildup can happen quickly, making spring the most common time for air conditioner smell issues. Common AC Smells and What They Mean Musty Smell from AC Vents If your AC smells musty, it’s usually caused by moisture buildup in your system. This can lead to mold or mildew growth in areas like your evaporator coil or drain line. Burning Smell When AC Turns On A slight burning smell when you first turn on your AC can be normal—it’s often just dust burning off internal components. However, if the smell continues, it could signal an electrical issue and may require HVAC repair in Lexington, SC. Dirty Sock Smell from Air Conditioner This unpleasant smell is often caused by bacteria buildup on your evaporator coil—a common issue in humid areas like the Midlands. If your AC smells like dirty socks, it’s time for a professional cleaning. Chemical Smell from AC Unit A strong chemical or sweet smell could indicate a refrigerant leak. This is not something to ignore and should be addressed by a licensed technician right away. Burning Plastic or Electrical Smell If you notice a sharp, electrical odor, turn off your system immediately. This could be a wiring issue and requires immediate attention. How to Get Rid of AC Smells If you’re dealing with a smelly AC unit, here are a few steps you can take: Replace your air filter to improve airflow and reduce odors Check your thermostat settings to ensure proper system operation Clear debris from your outdoor unit Schedule a professional HVAC tune-up Routine maintenance is the best way to prevent AC odor problems and improve your system’s performance. When to Call for AC Repair in Lexington, SC While some smells are temporary, others shouldn’t be ignored. You should contact a professional if: The smell doesn’t go away after a few hours Your home feels humid or uncomfortable You notice reduced airflow or cooling performance The odor is strong, chemical, or electrical Catching these issues early can help prevent costly repairs later—especially before the peak summer heat hits Lexington. Trusted AC Service in Lexington, SC  At Brian’s Heating & Cooling, we specialize in diagnosing and fixing air conditioner odor issues quickly and efficiently. Whether it’s a simple cleaning or a more complex repair, our team is here to help keep your home comfortable and your air clean. If your AC smells off this spring, don’t wait— schedule your service today and get ahead of the summer rush.

As February winds down here in Lexington, SC, we’re in that familiar South Carolina transition period—cool mornings, mild afternoons, and just enough chilly nights to keep the heat running. Before you know it, spring pollen will arrive and air conditioners will start working overtime. This “in-between” season is actually one of the most important times of year for your HVAC system. A little attention now can help prevent breakdowns when temperatures (and humidity) climb. Here’s what Lexington homeowners should be thinking about as we head toward spring. Don’t Wait for the First Hot Day to Test Your AC Many homeowners don’t realize their air conditioner has an issue until the first warm day hits—and by then, HVAC companies across Lexington are already busy. Now is the perfect time to: Turn your AC on briefly to ensure it’s running smoothly Listen for unusual sounds Check that cool air is coming from vents Make sure your thermostat switches properly between heating and cooling If something seems off, addressing it early is almost always faster and less stressful than waiting for a 85° afternoon in April. Replace Your Air Filter Before Pollen Season Hits If you’ve lived in the Midlands for even one spring, you know what’s coming: pollen everywhere. That yellow-green dust doesn’t just coat your car—it also impacts your indoor air quality. Replacing your HVAC air filter now helps: Improve airflow and system efficiency Reduce dust and allergens inside your home Protect your system from strain Keep indoor air cleaner during peak pollen weeks For most homes, changing filters every 1–3 months is ideal. If you have pets, allergies, or a larger household, you may benefit from more frequent changes. Why Spring HVAC Maintenance Matters in South Carolina South Carolina’s humidity and long cooling season put a lot of stress on air conditioning systems. A spring tune-up helps ensure your system is ready for months of steady use. Professional maintenance typically includes: Cleaning coils and components Checking refrigerant levels Inspecting electrical connections Testing thermostat operation Ensuring proper airflow and efficiency Catching small issues now can prevent larger repairs—or even system failures—once temperatures rise. Heat Pump Owners: Pay Attention to the Transition If your home uses a heat pump, this time of year is especially important. Your system will soon switch from heating mode to cooling mode for the long haul. A seasonal check can confirm: The reversing valve is working properly Defrost and cooling functions are operating correctly Airflow is balanced throughout your home Ensuring everything transitions smoothly now helps avoid performance issues later in spring and summer. Think Ahead Before the Busy Season Once warmer weather arrives in Lexington, HVAC service schedules fill up quickly. Planning ahead gives you more flexibility and peace of mind. Whether your system needs a quick check, seasonal maintenance , or you’ve noticed it struggling during temperature swings, late winter is one of the best times to take care of it. Brian’s Heating & Cooling is proud to serve homeowners throughout Lexington and the surrounding Midlands with reliable, honest HVAC service. If you want to head into spring confident your system is ready, our team is here to help keep your home comfortable all season long.