Furnace tune-ups in Philomont.

The Census figures Philomont borrows come from ZIP 20132, the Purcellville ZIP area around it, because Philomont’s own ZIP, 20131, is post office boxes only. There propane and electricity each heat about 42 percent of owner homes, while natural gas and oil heat about 6 percent each. So propane furnaces and heat pumps are the two machines the numbers point to. Price for one system: $69, regularly $99. In electric houses, a heat pump, a boiler or a ductless mini split with its outdoor unit counts as one system at that price.

Three feet is the clearance Loudoun County Fire and Rescue gives for anything that can burn near heating equipment. Its other yearly advice is a cleaning and inspection of the heating equipment and the chimney by a qualified professional. In its fall clock-change reminder, the county’s fire and rescue system adds a carbon monoxide alarm outside each sleeping area and on each level, tested monthly. The tune-up is that professional look at the furnace itself.

Winter here is long. The Purcellville station counts 4,942 heating degree days, a January low averaging 24.5F and 114.7 days a year with lows at or below 32F. Philomont logged a wind chill of -9F on December 24, 2022, and the coldest nights of the January 2026 arctic outbreak fell under Extreme Cold Warnings. A furnace that has been checked before those nights has had its safeties tested in the order it lights, heats and shuts down.

Timing follows the thermometer. The median first fall low of 32F at the Purcellville station lands on October 25, and the median last one on April 16, so the heating season covers most of six months. About 6 percent of owner homes in the ZIP area heat with oil. An oil burner is the one fuel we don’t service, and we would rather say so than waste a booking.