2025 Fall HVAC Maintenance Checklist

As autumn settles in and temperatures begin to drop, it’s time to consider how to keep your home warm and comfortable during the winter. By following a few simple steps, you can ensure that your heating system runs smoothly and efficiently all winter.

The team at Comfort Zone Service is committed to your comfort. Here, we’ve created a handy 2025 fall HVAC maintenance checklist you can use to prepare your HVAC equipment for the cold weather.

17 Steps to Get Your Heat Ready

1. Swap the Air Filter
   Check it now. Replace disposable filters or wash reusable ones. A clean filter protects the blower, evens out temps, and helps the system breathe. If you need the right size, see HVAC air filter replacements.

2. Clear Space Around the Equipment
   Keep at least three feet of open space around the furnace or boiler. Store boxes and paints elsewhere. Good airflow and safe access matter.

3. Vacuum Supply and Return Vents
   Remove vent covers and vacuum dust buildup. Make sure registers are open and not hidden under rugs or furniture.

4. Clean Up Around the Outdoor Unit
   Remove leaves and debris around the condenser. Clear airflow helps during shoulder season operation and keeps the area safe.

5. Check the Thermostat and Create a Fall Schedule
   Switch to Heat. Set a weekday plan with lower temps while you sleep or are away. If your control is dated, consider a thermostat replacement so schedules are easy to set and keep.

6. Run a Full Heating Cycle Test
   Turn the heat on and let it run for several minutes. Listen for odd sounds. Check that warm air reaches every room and shuts off normally.

7. Check Carbon Monoxide Protection
   Test CO detectors and replace batteries. Place at least one on each floor and near sleeping areas. Replace units that are past the manufacturer’s date.

8. Inspect the Condensate Drain and Pump
   Pour a cup of water into the furnace condensate trap. Make sure it drains. Clear slime with an approved cleaner if needed.

9. Look Over Visible Ductwork
   Seal small gaps at joints with UL-rated foil tape. Skip cloth duct tape. If some rooms never warm up, ask about airflow balancing to even things out.

10. Set Winter Humidity
    Target 30 to 40 percent relative humidity. Replace the humidifier water panel if you have a whole-home unit. If you do not have one, a whole-home humidifier helps the house feel warmer at a lower setpoint.

11. Bleed Radiators and Check Boiler Pressure
    For hydronic systems, bleed trapped air from radiators. Verify boiler pressure on the gauge when cool. If you notice leaks or persistent air, schedule boiler repair.

12. Keep Baseboards and Radiators Clear
    Leave a few inches of space around baseboard heaters and radiators. Do not drape curtains over them. Clear dust with a soft brush.

13. Reverse Ceiling Fans to Clockwise
    Run on low to gently move warm air down the walls. This evens out temperatures and allows a slightly lower setpoint.

14. Check the Flue and Vent Terminations
    Make sure nothing blocks the exhaust or intake. Look for nests and leaves now, then check again after the first snow.

15. Inspect the Furnace Switch and Doors
    Confirm the service switch is on. Reseat the blower door so safety switches engage. Loose panels can stop a system from running.

16. Walk the Home With a Draft Check
    On a breezy day, feel around windows, doors, and attic hatches. Weatherstrip or caulk obvious leaks. Close the fireplace damper when not in use. For more ways to save once the cold arrives, see how to lower your heating bill.

17. Schedule Professional Maintenance
    A fall tune up catches problems early, verifies safe operation, and keeps efficiency on track before the deep freeze. Book your heating tune up now. If your furnace is getting older, plan ahead with our guide to average furnace life span so winter does not surprise you.

Quick Signs You Should Call a Pro Now

• You smell gas or see soot

• The system short cycles or needs frequent resets

• Water near the furnace or boiler

• CO alarm sounds or if anyone feels ill

• Rooms stay cold even after filter changes and vent checks

Simple Weekend Game Plan

• Replace the filter and vacuum two return grilles

• Flip fan direction and set a weekday heat schedule

• Weatherstrip one drafty door and one window

• Test CO detectors and write the replacement dates

• Pick a date for your fall tune-up before the first hard freeze

Why Fall Maintenance Pays Off

• Fewer breakdowns when the first cold front hits

• Safer operation with combustion and venting checked

• Steadier comfort from room to room

• Better efficiency and lower run time through winter

Ready to Schedule

If you want a fast check and a clean start to heating season, schedule heating service. You can also look over our expert heating services, coupons, and financing options before you book.

Don’t wait until the first snowfall to think about your HVAC system. Call Comfort Zone Service today or request an appointment online.

Winter And Fall HVAC FAQs

What Thermostat Setting Saves Money In Winter?

Most homes feel comfortable near 68 to 70 degrees when occupied. Lower the setting when you sleep or leave for the day and bring it back up before you wake or return. Small setbacks like this can lower your heating bill without sacrificing comfort.

How Often Should I Replace My Furnace Filter In Cold Weather?

Check monthly during heavy use and replace at least every 90 days. Homes with pets, renovations, or allergies may need more frequent changes. A clean filter improves airflow and helps the system run shorter cycles.

What Humidity Level Is Best For Winter Comfort

Aim for 30 to 40 percent relative humidity. Dry air makes your home feel colder at the same thermostat setting. If you need better control, explore whole-home solutions for indoor air quality.

Why Does My Furnace Turn On And Off Frequently

Short cycling often points to restricted airflow or a safety control issue. Start with a fresh filter and make sure supply and return vents are open. If cycling continues, schedule a check for heating repair so the system runs safely and efficiently.