September Home Maintenance Checklist: Heating Starts on Paper

September's list is about heat you won't need for weeks: get the furnace tune-up done or booked, review the water heater's model-specific maintenance schedule, inspect visible venting from a safe position, and check the dryer exhaust system. Then use mild weather to inspect exterior joints, weatherstripping, and pipe insulation. Add a 15-minute downspout check and a look at the washing machine hoses.

Our fall maintenance guide walks the entire season. This page is narrower: what belongs on the calendar in September, before October's leaves and first frosts change the job.

Get the heating system serviced before you need it

If you booked ahead in August, your appointment lands this month. If not, call today; every week of delay puts you deeper into the post-first-cold-night rush.

The fall visit is professional work for gas and propane furnaces. The technician should follow the installed model's procedures for combustion, the heat exchanger, fuel connections, venting, controls, and safety devices. CDC recommends annual qualified service for fuel-burning heating systems. Ask what the visit includes and get a local quote.

Timing shifts with climate. In cold zones 5–7 aim for early September; Minneapolis can see frost before the month ends. In hot-humid zones 1–2 the AC is still doing the heavy lifting, and the heating visit can slide to October.

While you wait for the pro, inspect visible vent sections from a safe, accessible position for corrosion, damage, a loose connection, or soot. Do not touch, seal, or repair venting yourself. Stop using the equipment and contact a qualified professional if the vent is disconnected or you suspect exhaust is entering the home.

Fireplace owners need service that matches the appliance and venting. Arrange annual inspection by a qualified chimney professional before regular use; cleaning and repair depend on the fuel, deposits, damage, appliance, and installed system. For a gas fireplace, CPSC recommends yearly professional inspection of the appliance and its venting. Ask the technician to follow the installed model's manual and provide a local quote.

Review the water heater manual and inspect for leaks

Spend 10 to 15 minutes on the checks that apply to every water heater:

1. Photograph the rating plate and record the manufacturer, model, serial number, and installation date if known.
2. Find the manual for that exact model and read its maintenance schedule.
3. Check the unit, fittings, drain pan, and nearby floor for water, rust, or corrosion.
4. For a fuel-burning model, confirm the annual professional appliance, flue, and vent inspection is booked.

The manual controls the rest. Tank draining, relief-valve service, anode inspection, heat-pump air-filter and condensate care, and tankless inlet-filter or descaling work vary by model. The manufacturer also specifies the safe shutoff sequence, approved cleaning solution, and restart steps. Use a licensed plumber or qualified technician when the procedure, valves, venting, or fuel-burning equipment are outside your experience. The sourced water heater maintenance guide separates each equipment type.

Review the dryer exhaust system

The U.S. Fire Administration recommends cleaning the lint filter every time you use the dryer and having the exhaust duct cleaned yearly. SeasonKeep's six-month reminder gives you another chance to spot a problem; it does not mean every duct needs a second full cleaning.

From a safe position, check the accessible transition duct for damage or crushing and confirm the exterior hood opens while the dryer runs. Follow the dryer manual for owner-accessible care. Arrange qualified cleaning or repair when the yearly service is due, the run is long or concealed, the duct material or connection is uncertain, or loads take longer and the dryer runs unusually hot.

Seal the envelope while caulk can still cure

Sealant work needs mild, dry weather, and September is usually the last reliable stretch of it in the northern half of the country. Three jobs, all easy:

• Inspect exterior sealant. Check accessible joints around windows, doors, trim, penetrations, and material transitions for gaps, cracking, loss of adhesion, or staining. Identify the joint and drainage path before removing anything, and use the component and sealant instructions together. Do not cover weep openings or failed flashing. Zones 5 and colder get a second annual check before freezing weather, but the reminder does not mean every joint needs replacement.
• Inspect weatherstripping and the garage-to-house door. Replace ordinary weatherstripping at attic hatches and other interior boundaries when it is worn. For an attached garage, first identify the installed door and gasket or seal requirements; do not replace a rated component with ordinary weatherstripping. Confirm the door closes and latches and that the surrounding wall and ceiling have no visible openings. USFA recommends a 20-minute fire-rated, self-closing, self-latching door, but local code and the home's construction determine the required assembly. Have a qualified contractor evaluate missing labels, damage, penetrations, or a failed closer or latch. Never rely on the separation for carbon-monoxide control: CDC says not to run a vehicle in an attached garage even with the overhead door open.
• Check accessible pipe insulation. Look for gaps, splits, moisture, compression, or missing sections in unheated spaces. Follow the product instructions and preserve clearance from flues, heat sources, and electrical equipment. Do not enter an unsafe attic or crawl space or disturb suspect asbestos-containing material.

Point water away from the foundation

Full gutter cleaning waits until the leaves actually drop (that's an October job), but two drainage checks belong in September.

First, check downspout discharge from the ground. Confirm every extension is connected and sends water to a stable location away from the building without causing erosion, ice, or a neighbor problem. EPA programs use different distances for different drainage designs, so grading and local requirements matter more than one universal number. Persistent pooling needs a drainage assessment.

Second, in the hot-dry West, September can still be fire season. Dry leaves and pine needles in roof valleys and gutters provide fuel for wind-blown embers. Inspect from the ground and use qualified roofing or gutter service for roof and gutter access; do not treat a low slope as permission to walk the roof.

Two ten-minute checks worth the calendar space

Without pulling or straining the washer, inspect accessible inlet hoses for bulges, kinks, cuts, wear, corrosion, moisture, or pooling water. Follow the washer manual for hose type and replacement interval. Many Whirlpool models specify five years, but the installed instructions control.

Sump pump owners who skipped the August test should use the installed pump or controller manual now. Stay dry, keep hands and tools out of a powered pit, and verify that the pump starts, lowers the water, stops, and discharges normally.

If you have a pool or a septic system

If your pool is normally closed for winter, schedule the work before sustained freezing weather. Use the exact equipment and cover instructions or a qualified pool professional to drain and protect the components that require winterizing. Do not improvise a compressed-air line blowout or open a pressurized filter. CDC warns that pool chemicals can injure people when mixed, so follow each product label and keep products separate. Pentair's winterizing guidance likewise puts line and equipment winterization with a pool professional. Year-round pools need the installed system's freeze plan rather than a generic closing procedure.

Septic owners due for service should book a qualified provider while access is good. EPA recommends professional inspection at least every three years for a typical household system, with more frequent service for systems that have pumps, floats, or mechanical parts. Pumping should follow measured tank condition, system design, household use, and local requirements.

Common questions

Is it too late to book a furnace tune-up in September?

No, but complete qualified service before regular heating use. Appointment availability varies by local weather and contractor capacity, so ask local providers rather than relying on a national lead-time estimate.

Can I flush the water heater myself?

Only if the exact model manual provides a homeowner procedure that you can follow safely. Draining and restart steps vary, hot water can scald, and an old drain or relief valve may not reseal. Use a licensed plumber if the manual is missing, the shutoffs are unclear, or the unit has fuel-burning or venting concerns.

Should I clean the gutters now or wait for the leaves?

Wait, unless you're in wildfire country. The drainage cleaning is an October or November job, done after most leaves are down. The exception is fire fuel: dry needles and roof debris should come off now in the hot-dry West.

What's the one task I shouldn't skip this month?

The dryer exhaust review, if forced to pick. Accumulated lint and restricted airflow can create a fire risk, and the yearly cleaning may be due. For the water heater, complete the manual and leak review and book any service the exact model requires.

The right September list depends on the house: no chimney means there is no chimney inspection to book, city sewer means the pump-out paragraph is not yours, and a zone 2A homeowner can often schedule the heating visit later. SeasonKeep sorts the rules using your ZIP code, build year, and installed systems. When this month's boxes are checked, the October checklist continues with colder-weather preparation.