DOE and EPA maintenance guidance identifies several recurring priorities: unobstructed HVAC airflow, clear condensate drainage, prompt response to leaks, maintained roof drainage, and equipment service consistent with manufacturer instructions.
The appropriate month varies by climate, so this calendar is organized around cooling season, heating season, heavy rain, and freezing weather rather than fixed national dates.
A five-minute monthly walk-through
Look at the HVAC filter and follow the equipment and filter maker’s replacement instructions. Pets, construction dust, long run times, and wildfire smoke can shorten the interval. While you are there, make sure furniture is not blocking return or supply grilles.
Then look for water: under sinks, around toilets and the water heater, below roof penetrations, at the condensate pan, and along basement or crawl-space walls. Musty odor, staining, or a damp box deserves attention. EPA advises drying wet materials within 24 to 48 hours when possible to reduce the chance of mold growth.
Finally, glance at the utility bill. Compare it with the same month last year, but account for weather, rate changes, guests, thermostat settings, and new loads. An unexplained jump is a reason to investigate, not proof that one appliance has failed.
Before the first serious heat
Clear leaves and plants that block the outdoor cooling unit, taking care not to bend its delicate fins. Check the condensate pan and drain. Test the thermostat and review its schedule. If the system iced up, drained poorly, made new noises, or failed to maintain temperature during prior operation, have the cause diagnosed before extended cooling operation.
Check operable windows, exterior shade, and weatherstripping too. Opening windows can be a great cooling strategy when outdoor air is cooler and clean; it is a poor one during high humidity, smoke, or heavy pollen.
DOE reports that cleaning or replacing a dirty air-conditioner filter can cut the unit’s cooling-energy use by 5% to 15%. The key word is unit: that is not automatically the same percentage off the whole electric bill.
When spring rain begins
View the roof from the ground or another safe location. Missing material, bent flashing, stains in the attic, or a recurring ceiling spot calls for a closer professional inspection. Clean gutters and make sure downspouts carry water away from the foundation rather than dumping it beside a basement wall. EPA lists maintained gutters and grading away from the house among its moisture-control measures.
Test the sump pump and its approved backup before storm season. Check that exterior drains and window wells are clear. If water and electricity meet, stay out of the area until it is safe; a maintenance checklist is never a reason to step into energized water.
Before heating season
Schedule inspection or service for fuel-burning equipment as the manufacturer and local rules require. Soot, changing flame appearance, odors, repeated shutdowns, or a carbon-monoxide alarm are not “keep an eye on it” conditions.
Test smoke and carbon-monoxide alarms according to their instructions, including any end-of-life replacement date. Protect exposed pipes before freezing weather and label the main water shutoff so anyone in the home can find it. Heat-pump owners should learn what the auxiliary-heat indicator looks like; long, unexpected backup-heat operation can sharply increase electricity use.
As leaves start falling
Clear roof drainage, outdoor drains, and the area around heat-pump equipment. Check door sweeps and window seals, but repair rot or trapped water before caulking over it. Look at accessible duct connections and damaged duct insulation. Ordinary cloth “duct tape” is not a durable duct-sealing repair.
Turn on the bath fans and kitchen exhaust and verify that air reaches an outdoor termination—not an attic. Dryer exhaust deserves the same attention, following the appliance maker’s instructions.
One annual reset
Put model numbers, filter sizes, service dates, warranty papers, and shutoff locations in one folder. Update photos for the home inventory and review insurance limits. Check appliance hoses and the household outage plan. Service the water heater only according to its instructions; a long-neglected tank can require a different approach than a regularly maintained one.
Leave refrigerant handling, panel work, combustion testing, structural roof repair, contaminated flood cleanup, and suspect asbestos or lead to qualified people. The point of routine maintenance is to reduce risk, not move it from the house to the homeowner.
Reviewed August 20, 2026. Program rules, codes, utility rates, and local requirements can change; confirm them for the property before starting work.
This guide is educational and does not replace project-specific tax, legal, medical, or engineering advice.