Annual heating maintenance: what to do and when
Heating maintenance is a short routine: a few homeowner checks each season, a professional inspection once a year, and a quick look for anything unusual in between. Done before the first cold weather, it lowers the chance of a winter breakdown and helps the system run closer to its rated efficiency.
What heating maintenance can you do yourself?
The jobs homeowners can do safely are mostly about air, access and observation. None of them needs tools beyond a vacuum and a screwdriver, and none involves opening a gas or electrical enclosure.
- Check the filter. A clogged filter chokes airflow and strains the blower. Look at it monthly in winter and replace it when it is dirty, using the size printed on the old one. The winter bill guide shows how airflow affects cost.
- Clear the area. Keep boxes, laundry and stored items away from the furnace, boiler and any air intake or exhaust.
- Open the registers. Vacuum vents and returns, and move furniture or rugs that block them.
- Check the thermostat. Test the schedule and the temperature settings, and replace batteries if it uses them.
- Look outdoors. Keep intake and exhaust pipes, and the outdoor unit of a heat pump, free of snow, ice and leaves.
- Test alarms. Test the smoke and carbon monoxide alarms and replace any that are past the date on the label.
What should a professional heating inspection cover?
A yearly visit by a licensed technician handles what a homeowner should not. For a gas furnace that normally means checking the burner and ignition, measuring combustion and gas pressure, inspecting the heat exchanger for cracks, checking the vent and flue for blockage, testing safety controls, cleaning components and checking the blower and airflow. Oil systems also need the nozzle, filter and combustion checked. The details of such a visit are in our guide to the annual furnace tune-up.
Book in late summer or early autumn, before the first cold weather, when technicians are less busy. Ask for a written report. Some warranties expect annual service, and a service contract may be a convenient way to ensure it happens.
How do heat pumps and boilers differ?
A heat pump has its own checklist. The outdoor unit needs clear space on all sides, no snow piled against it and a clear path for meltwater when it defrosts. Indoor filters and coils need cleaning, and a technician should check refrigerant, electrical connections and drainage. The heat pump maintenance checklist goes through each item.
A boiler or hydronic system needs different attention. Look for leaks and damp spots around the boiler, pipes and radiators, because water damage can start small. Read the pressure gauge and compare it with the range in the manual, and ask a technician to check the expansion tank, circulator pumps, venting and controls. Electric baseboards need dust vacuumed from the fins and the area around them kept clear of curtains and furniture. Each of these systems has a typical service life, which the lifespan guide compares.
What does a seasonal heating maintenance schedule look like?
A simple calendar keeps the routine from slipping.
- Late summer or early autumn: book the professional inspection, replace the filter, test alarms and the thermostat, clear the surroundings and make sure outdoor vents are open.
- During the heating season: check the filter monthly, listen for new noises, watch for uneven rooms, and keep snow and ice away from outdoor units and vents.
- Spring: note any problems from the winter and have them dealt with while demand is low, and replace filters before the cooling season if you have central air.
Humidity belongs on the list. Winter air indoors can get dry, and a humidifier needs its own cleaning and pad or water panel replacement. Keep indoor humidity at a level that avoids condensation on windows, because too much moisture can cause its own damage.
When should you call for help instead?
Call a professional for banging, rattling or burning smells, rooms that stay cold, a system that cycles on and off every few minutes, or a rising energy bill with no change in habits. Leave the house and call the utility or emergency services if a carbon monoxide alarm sounds or you smell gas. The winter heating emergency guide walks through the order of actions.
A pattern of repairs is a signal in itself. The repair or replace guide explains when maintenance stops being the answer.
Quick answers
How often should heating be serviced?
Once a year by a licensed technician, ideally before the heating season, with simple filter and clearance checks by the homeowner in between.
What should I check on my furnace before winter?
Replace or clean the filter, clear the area around the furnace, open the vents, test the thermostat and alarms, and book a professional inspection.
Can I clean my own furnace?
You can change the filter and vacuum vents and the area around it. Burners, heat exchangers and gas or electrical parts should be left to a licensed technician.
Do electric heaters need maintenance?
Yes, though less. Vacuum dust from baseboards and fan heaters, and keep curtains and furniture clear.