By the Certified Technicians at Mays Plumbing & HVAC – Serving the Midlands Since 2005
As cooler air settles over South Carolina and the trees turn deep shades of red and gold, homeowners start thinking about comfort indoors. While our winters are generally mild compared to northern states, they come with unpredictable temperature swings, damp air, and the occasional cold snap that can surprise even longtime residents.
In Columbia, for example, winter highs average around 58°F while lows dip into the 30s — mild enough to enjoy a walk outside but cool enough to rely on heating at night. That’s when proper HVAC winter preparation becomes essential. Without it, you risk higher energy bills, uneven temperatures, and unexpected breakdowns just as the chill sets in.
At Mays Plumbing & HVAC, we’ve been keeping Midlands homes comfortable for nearly two decades. Our NATE-certified technicians have seen everything from frozen coils in humid attics to furnaces running nonstop due to thermostat miscalibration. Drawing from real service experience across Chapin, Lexington, Irmo, and Newberry, we’ve outlined the most reliable ways to get your system winter-ready.
Why HVAC Winter Preparation Matters in South Carolina
South Carolina’s climate is a mix of subtropical humidity and sudden Arctic fronts. That blend makes heating systems work harder than most realize. Moist air can seep into ducts and cause corrosion or mold, and the rapid temperature swings often make older thermostats overcompensate, driving up energy use.
According to the U.S. Energy Information Administration, the average South Carolina household spends about $1,200 per year on heating and cooling. A neglected system can increase that cost by 10–20% and shorten the lifespan of your unit.
Routine maintenance can do the opposite — extending the system’s life by years, improving indoor air quality, and keeping energy use in check. For homeowners in humid areas like Lexington, Prosperity, or Greenwood, those savings add up quickly.
Step 1: Assess the Health of Your HVAC System
Before scheduling a tune-up, take a few minutes to look and listen for signs of trouble.
If your HVAC system rattles, grinds, or cycles on and off too often, something may be off with the motor or belt. Uneven heating between rooms often points to duct leaks, blocked vents, or thermostat issues.
Humidity is another silent culprit in our region. Condensation on metal ducts or near vents can lead to mold and musty odors. A simple hygrometer — available at most hardware stores — helps you keep indoor humidity between 30% and 50%. Above that, your HVAC is likely fighting unnecessary moisture, which strains the system and worsens air quality.
If your system is over ten years old or hasn’t had professional service in the last year, it’s time for a full inspection.
Step 2: Schedule a Professional HVAC Tune-Up
A professional HVAC inspection is the best way to prepare for winter. At Mays Plumbing & HVAC, our tune-ups follow ASHRAE and ENERGY STAR standards to ensure every component is working efficiently.
During a standard winter checkup, our technicians:
- Replace or clean air filters to restore airflow and reduce dust buildup.
- Inspect and clean coils to prevent freezing and improve heat exchange efficiency.
- Check refrigerant levels and electrical connections to prevent short-cycling and power issues.
- Test ductwork for leaks and seal problem areas to minimize energy loss.
- Calibrate the thermostat for accurate temperature control.
These simple but thorough steps can lower energy bills by up to 15% and prevent unexpected repair calls during cold fronts.
Step 3: Practice Simple At-Home Maintenance
Between professional visits, homeowners can keep their systems running efficiently with a few easy steps.
- Change filters regularly – Replace them once a month during winter to maintain airflow and keep indoor air clean.
- Keep outdoor units clear – Remove leaves, pine needles, and debris that can block air circulation.
- Insulate ducts and exposed pipes – This reduces heat loss and keeps warm air moving through your home efficiently.
- Seal drafts – Use weatherstripping and caulk to close gaps around doors and windows. Even small leaks can make your system work harder.
These simple maintenance habits make a big difference over time — especially in South Carolina’s mix of cold nights and humid afternoons.
Improving Energy Efficiency in the Midlands
Energy efficiency isn’t just about cutting costs; it also keeps your home more comfortable throughout the season.
Setting your thermostat around 68°F while you’re home and lowering it when you’re away can save roughly 10% on heating costs. Reversing ceiling fans so they rotate clockwise pushes warm air downward, improving circulation.
Humidity control also matters. Run exhaust fans in kitchens and bathrooms to reduce moisture, and if your home feels damp, consider a whole-home dehumidifier.
If your system is older, now is the best time to look into high-efficiency heat pumps. Federal rebates and South Carolina energy programs — such as the HOMES rebate and Dominion Energy incentives offer thousands in potential savings for qualifying HVAC upgrades. Our team helps homeowners navigate the paperwork to make the process easier.
Common HVAC Problems During South Carolina Winters
Even a well-maintained system can face seasonal challenges. Humidity and temperature swings can lead to short-cycling, frozen coils, or inconsistent heating.
Frozen coils are often caused by low refrigerant levels or dirty filters that restrict airflow. If this happens, turn off your system and let the ice melt naturally before calling a technician. Mold growth from trapped moisture can also be a concern in humid homes. Installing UV lights or an in-duct dehumidifier can help prevent this.
Another frequent issue is poor insulation, especially in attics. Upgrading to R-38 insulation helps your HVAC retain heat and maintain consistent temperatures across rooms.
When to Call a Professional
Some HVAC issues should never be handled alone. Call a professional immediately if you notice burning smells, gas odors, unusual noises, or visible ice buildup on refrigerant lines.
Mays Plumbing & HVAC offers same-day service across the Midlands, including Columbia, Lexington, Irmo, Chapin, Newberry, and surrounding areas. Our technicians are available 24/7 during winter to handle heating emergencies quickly and safely.
Expert Insight: How Our Team Approaches Winter Preparation
Our technicians are more than just service providers — they’re specialists who live and work in the same South Carolina communities they serve. Every tune-up is guided by field experience and an understanding of our region’s unique humidity and temperature patterns.
We don’t just replace filters and check coils. We look for long-term solutions that improve comfort, energy efficiency, and air quality. That’s why so many homeowners across the Midlands trust Mays Plumbing & HVAC for ongoing maintenance year after year.
Final Thoughts
Proper HVAC winter preparation protects your home, your comfort, and your budget. A few hours of maintenance now can prevent costly repairs later and keep your system running efficiently all season.
Whether you handle basic upkeep yourself or prefer professional service, we’re here to help. Our team provides complete seasonal tune-ups starting at $99, free estimates, and assistance with available rebates.
If you’re in Columbia, Lexington, Irmo, Chapin, Newberry, Greenwood, or Prosperity, call (803) 321-5979 to schedule your winter service today. With the right care, your home will stay warm, efficient, and ready for every cold morning ahead.