How to Keep Your Heating System Efficient During a Cold Snap

When temperatures drop unexpectedly in Charleston, SC, many homeowners realize their heating systems aren’t fully prepared for a true cold snap. While Lowcountry winters are usually mild, an unusual freeze can put extra strain on your HVAC system, increase energy bills, and create uncomfortable cold spots throughout your home. With a few proactive steps, you can stay warm and comfortable while keeping your heating system running efficiently.

Set Your Thermostat Strategically

It’s natural to want to crank up the heat when temperatures plunge, but setting your thermostat too high won’t warm your home faster. Instead, aim for a steady, efficient temperature—around 68°F when you’re home and awake is typically recommended. Avoid large temperature swings, as they force your system to work harder and longer than necessary.

If you have a programmable or smart thermostat, use it to maintain consistent settings throughout the day and night. Gradual adjustments help your system operate more efficiently and reduce unnecessary wear and tear.

Replace Your Air Filter

During a cold snap, your heating system may run more often than usual. A dirty air filter can restrict airflow, making your system strain to circulate warm air. This not only reduces efficiency but can also increase the risk of breakdowns.

Charleston homes often deal with humidity and airborne particles year-round, so checking your filter monthly during peak usage periods is a smart habit. Replacing a clogged filter is one of the easiest and most affordable ways to improve efficiency and maintain good indoor air quality.

Seal Drafts and Air Leaks

Even in the Lowcountry, cold air can sneak in through gaps around doors, windows, and attic openings. These drafts force your heating system to run longer cycles to maintain indoor comfort.

Inspect your home for visible gaps and seal them with weatherstripping or caulk. Install door sweeps where needed and consider draft stoppers for older doors. Reducing heat loss keeps your home more comfortable and helps your system operate at normal cycling intervals instead of running constantly.

Improve Insulation

Insulation isn’t just important for northern climates. In Charleston, proper attic insulation can make a significant difference during temperature swings. Good insulation helps trap warm air inside and prevents heat from escaping through the roof.

If certain rooms feel noticeably colder than others, insufficient insulation may be contributing to the issue. Improving insulation can enhance comfort during a cold snap and lower energy costs year-round.

Use Natural Heat to Your Advantage

When the sun is shining, take advantage of it. Open the curtains and blinds on south-facing windows during the day to let in natural light and warmth. This passive solar gain can slightly reduce the workload on your heating system.

Once the sun sets, close blinds and curtains to create an additional barrier against the cold. This simple routine can help stabilize indoor temperatures overnight.

Schedule a Professional HVAC Check

If your heating system hasn’t been serviced recently, a professional inspection can make a big difference. Even in Charleston’s relatively mild climate, components can wear down over time.

An HVAC technician can check for airflow issues, worn parts, or inefficiencies that may become more noticeable during a cold snap. Preventative maintenance helps ensure your system operates safely, efficiently, and reliably when you need it most.

Go With Charleston’s 1st Choice in HVAC and Plumbing. Schedule an appointment with 1st Choice A/C, Heating, Plumbing & Gas, LLC for maintenance or repairs.