How do I prepare my HVAC system for winter?

Answered by the Billy Butler HVAC team · August 28, 2026

How do I prepare my HVAC system for winter (the do-now checklist)

Start with the simple, low-risk items you can do yourself. Replace your return air filter (or clean it if it’s washable). A clogged filter commonly reduces airflow and can make the system run longer and less efficiently when heating demand increases.

Next, make sure supply vents and return grilles are open and not blocked by rugs, furniture, or curtains. Airflow restrictions can make a healthy system seem “weak” and can contribute to overheating or nuisance shutdowns depending on the equipment.

Then check the outdoor unit. If you have a heat pump, the outdoor unit runs in winter and needs clear airflow. Remove leaves and vegetation, keep a couple feet of clearance around it, and keep the top unobstructed. Avoid wrapping or fully covering a heat pump—during colder weather it will periodically defrost, and it needs to “breathe” to operate correctly.

Finally, test-run the system before you need it. Switch the thermostat to heat and run it for 10–15 minutes. You’re listening for abnormal noises, watching for short-cycling (rapid on/off), and confirming the system can maintain a steady run.

What to check depending on your system (heat pump vs. furnace)

Heat pumps: In Georgia, many homes use heat pumps, and winter weather often includes short cold snaps. It’s normal for a heat pump to deliver air that feels “warm-ish” rather than furnace-hot, and it may go into defrost mode occasionally (you might see brief steam outside). What isn’t normal is ice that never clears, loud grinding, or the system relying on auxiliary/emergency heat constantly—those are signs that airflow, controls, or the refrigeration side may need diagnosis.

Furnaces: Watch the start-up sequence. A brief dusty smell on the first run of the season can be normal, but persistent odors, soot, repeated shutdowns, or rumbling/booming at ignition are not. If you have any fuel-burning appliance, working carbon monoxide alarms (with fresh batteries) are an important part of winter prep.

Seasonal heating maintenance: what a winter-readiness check should include

Some winter breakdowns come from issues that build up over time—loose electrical connections, worn components, dirty blower parts, and airflow problems. A seasonal heating tune-up typically focuses on confirming the system is safe and operating within expected ranges. For winter readiness, a technician will commonly check items such as:

• Safety controls (including limit and rollout safeties where applicable)
• Heat rise / temperature split to confirm proper heat output
• Defrost controls and sensors on heat pumps
• Electrical connections, contactors, capacitors, and amp draw
• Airflow across the system (filter condition, blower performance, and obvious duct restrictions)

If you want to compare what’s included in a thorough visit, review what is included in an HVAC maintenance check.

When to do it in Gwinnett, Oconee, and Walton County winters

Across the Bethlehem/Bogart/Winder area and nearby counties like Gwinnett, Oconee, and Walton, winter often brings milder stretches punctuated by quick cold snaps. That pattern can catch homeowners off guard—especially with heat pumps, which may need to defrost and may lean more on auxiliary heat during the coldest mornings. The practical move is to test and service your heating system in early fall (or before the first cold snap) so problems show up when scheduling and parts availability are typically easier than during extreme-weather days.

Season-appropriate next step: schedule seasonal heating maintenance (heat pump or furnace) so the system can be checked for safeties, heat rise/temperature split, defrost operation, electrical health, and airflow before winter demand hits.

Next step: AC Repair  ·  Contact Billy Butler HVAC