Furnace and heating repair in Waterford.

Propane heats more than half of the owner homes in ZIP 20197, and the Census finds none on natural gas, so a furnace repair here is usually a propane furnace. The common jobs are a flame sensor cleaned at $95 to $180, an igniter replaced at $240 to $410 and a control board at $550 to $1,180. The diagnostic comes first at $99, and the repair is priced before the tech starts it. Oil is the fuel for about one owner home in six, and we don’t work on oil burners.

The median owner home here was built in 1996, and about a third date from before 1980, so a lot of Waterford furnaces are at the age where a repair has to be weighed against a replacement. The rating plate inside the furnace door gives its year and its fuel. Read it before you approve anything big. A furnace near thirty with a failed part is a different question from one a decade younger with the same part.

The Purcellville station logs 4,942 heating degree days in a normal year, 114.7 nights at or below 32 degrees and a January average low of 24.5. In the January 2016 blizzard, western Loudoun reported 30 to 36 inches of snow. A high-efficiency furnace that vents out a side wall can end up under a drift, and a buried vent shuts the furnace down on purpose. Dig the pipes out, try the thermostat again, and call if the burners stay dark.

Swapping a gas furnace in Loudoun takes a permit, and the county dropped the plans for a swap at the same BTUs in the same spot in October 2025. Where a new furnace would change the vent on a wall people can see in the central village, Loudoun’s Waterford Historic District has its review committee look at most exterior changes first. And in a power loss a propane furnace is as dead as an electric one, because the igniter and blower both need power.