As fall rolls in, the temperature outside drops dramatically. Nights get especially cold, and switch from cooling to heating can bring surprises you didn’t plan for. If your HVAC system hasn’t been looked at since spring, now’s your time to schedule a heating maintenance appointment with us.

For more tips and steps you can take yourself, read this guide!

Changing Your Air Filter

If you want to get your HVAC system ready for fall, the first task is simple. Change your air filter to help ensure optimal airflow, which impacts HVAC performance in many ways. If your filter has been in place since summer, it’s likely full of dust, pollen, and other particulate matter. That buildup makes the blower work harder than it should, which can be a problem as your system shifts to a heating function.

Fall often means more time spent indoors, so the quality of the air inside your residence matters. A fresh filter gives your system support to run efficiently and helps cut down on allergy flare-ups and dust circulation when the heat kicks on. If you’re not sure which size or type you need, check the old one before heading to the store.

Inspect and Test the Thermostat

Now is the time to test your thermostat in heating mode. Turn it up a few degrees and listen for the system to respond. If nothing happens, or if there’s a delay, the thermostat may not be sending signals correctly or reading temperatures accurately.

Programmable thermostats should also be reset for seasonal changes. Summer cooling schedules don’t always match your fall routine. If you’re using a smart thermostat, check for firmware updates or adjust your settings to address cooler temperatures.

Clear the Outdoor Unit

Even though you’re switching from cooling to heating, your outdoor unit still needs attention before fall sets in. Overgrown shrubs, falling leaves, and summer debris can block airflow and hold moisture where it does not belong. Walk around your condenser and clear out leaves, sticks, and weeds. Give the unit a once-over to spot any bent fan blades or signs of animal nesting.

Clean and Unblock Indoor Vents

Fall maintenance should always include a quick pass through every room to check the vents. If furniture has shifted, rugs have crept over floor grates, or curtains have started blocking wall vents, your airflow may be impacted. Your system works hard to push warm air through every corner of the house. When something blocks that flow, your HVAC unit compensates by running longer and working harder.

Use a vacuum to clean dust off the vent covers and make sure each one is open. If you use vent deflectors or filters, check that they’re clean and flush against the vent.

Test Your Heating Early

You do not want to find out your heater doesn’t work during the first cold snap. Switch your system to heating mode and let it run for at least 15 minutes. During that time, listen to any rattles, bangs, and spot unusual smells. A slight burning odor is normal if dust has settled on the burner or coils, but it should fade fast. Anything persistent may point to a deeper issue.

This is also a good time to walk through the house and check how evenly the heat is spreading. If one room stays cold while another overheats, your ductwork may need sealing or repair.

Seal Gaps and Drafty Spots

Your HVAC system is impacted by the quality of your insulation and how well-sealed your home is. Fall is a good time to check for leaks around windows, doors, and baseboards. If air can escape, your heater must run longer to make up for the difference. Use weatherstripping, caulk, or insulation tape to seal up problem spots.

Look Ahead to Humidifier Needs

If your HVAC system includes a whole-home humidifier, make sure it is cleaned and inspected before fall brings cool air. As the temperatures drop, so does indoor moisture. A clean humidifier helps reduce static, protects wood floors and furniture, and makes the air feel warmer even at lower temperatures.

Book Your Fall HVAC Service Now

When your HVAC system gets the attention it needs in the fall, it responds better when cold weather shows up early. From tune-ups to thermostat troubleshooting, getting ahead of the season gives your system the best shot at a smooth cold-weather run. We can help you out with all heating services, including repair, installation, and maintenance. Book your fall HVAC service today with Comfort Heating & Air Conditioning, LLC in Billings.

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