10/23/2026
6 Things You Should Clean Before You Turn the Heat On
As summer gives way to fall and temperatures begin to drop, it's time to fire up the furnace to keep your home cozy. Over the spring and summer months, dust, dirt and debris can accumulate around the house and on heating equipment. If left unaddressed before turning on the heat, this buildup can contribute to unpleasant odors, restricted airflow, reduced heating efficiency and poor indoor air quality. But preparing your home for heating season involves more than simply swapping filters and wiping down vents and registers. To help you get ready for colder weather, we've rounded up the things you should clean before turning on the heat, including several spots you probably haven't considered.
HVAC Filters
HVAC filters capture airborne dust and debris, protecting your HVAC system and helping it run at peak efficiency. So, naturally, swapping your HVAC filters (or cleaning them if they're reusable) is the first thing to address before turning the heat on for the first time.
Air Vents and Registers
While your return filter keeps dust and debris from reaching your furnace, much of that debris never even makes it to the filter, accumulating on the return grilles first. Clean off any dust, dirt or pet hair accumulation in and around the vents to remove buildup and keep the openings clear for proper airflow.
Under and Behind Furniture
You'll likely be spending more time indoors during the colder months, stirring up the dust, pet hair and other debris that have settled around the home. Before turning on your furnace, take time to vacuum under and behind furniture, or any other overlooked spot where debris may have built up during the warmer months.
Ceiling Fans
Many homeowners reverse their ceiling fans during the colder months to circulate warm air trapped at the ceiling without causing a chilly breeze. However, if you reverse them before cleaning off the matted dust (trust us, it's there), you're in for a dust shower. To avoid this, turn the fan off and carefully clean it using a vacuum or ceiling fan brush.
Baseboards and Trim
You may not have noticed (or maybe you've turned a blind eye), but baseboards and trim are notorious for accumulating dust, dirt, pet hair and more. Give them a thorough cleaning to remove this buildup and reduce the amount of dust collecting around your home during the winter months.
Outside HVAC Units
Leaves, grass clippings and other debris can accumulate around your outdoor HVAC unit during summer. If your heating system has an outdoor heat pump, remove debris from around the unit before winter for optimal operation. Even if you don't have an outdoor heat pump, it's still a good idea to clear away debris before winter to prevent buildup and keep the unit clear.
Before you turn your heat on for the winter months, take time to clean these things to avoid unpleasant smells, poor air quality and even fire risk.