How to Prepare Your Garage Heater for Winter

Garage heaters are workhorses that often get ignored until the temperature drops into the single digits. A heater that sat dormant all summer accumulates dust, spider webs, and debris that can impede airflow or pose a genuine fire risk if ignited while clogged. Getting this system ready isn't just about comfort; it is about ensuring the unit fires up reliably without tripping breakers or tripping safety sensors. Performing a seasonal tune-up involves clearing obstructions and testing the ignition sequence while the weather is still mild. Done well, your heater will provide consistent warmth throughout the winter without the soot, strange smells, or erratic cycling that comes from a neglected system. Think of this as clearing the airway so the heater can breathe properly under a heavy load.

Clear the danger zone. Remove all flammable materials, cardboard boxes, and paint cans from a three-foot radius around the unit. Ensure the heater's intake and exhaust vents are completely unobstructed by hanging storage or tools.
Dust off the exterior. Use a vacuum with a soft brush attachment to remove dust from the outer casing and cooling fins. Wipe down the exterior with a damp cloth to prevent dust from being drawn into the intake during the first cycle.
Swap or wash the filter. Locate the air intake filter, slide it out, and inspect it for heavy dust buildup. If it is a reusable mesh filter, wash it with warm soapy water; if it is a disposable paper filter, replace it entirely.
Blow out the burner. Carefully remove the access panel and use compressed air to blow out the burner assembly and the pilot orifice. Be gentle to avoid bending the thermocouple or damaging the ignition wires.
Verify all connections. Inspect electrical wires for fraying or loose terminals, and check gas lines for any signs of corrosion. If you smell gas at any point, leave the garage immediately and call a professional.
Light it up safely. Turn on the thermostat and wait for the heater to cycle through its startup sequence. Monitor it for five minutes to ensure the flame is steady and the exhaust is venting correctly.