In the gas houses of Kings Park, North Springfield and Ravensworth, the cooling coil usually rides on top of the furnace in the basement or utility room. All summer the blower worked for the air conditioner while the burners sat cold beneath a coil wringing water out of humid air. That hands the fall a filter that’s been in since June, dust on the blower, and now and then rust on the burners where the coil’s drain pan ran over.
Plenty of those 1950s and 60s houses heat through floor registers, and winter is when a rug, a sofa or a toy bin lands on two of them. Every covered register is air the blower can’t move, and it shows in the temperature rise, the degrees the furnace adds to the air passing through. The tune-up reads that number against the range on the rating plate; when it runs high, airflow is the first suspect.
West Springfield is two thirds gas, and about four in ten of its homes are townhouses, most from the 1960s and 70s. A gas furnace there often stands in a lowest-floor closet, sometimes beside the water heater, behind a louvered door whose slats let in the air the burners need. If a remodel swapped that door for a solid one, tell the tech; a flame short of air burns dirty.
Down in 22153 a furnace is the exception: about three in four Newington Forest owners and close to six in ten in Newington heat with electricity, usually a heat pump with backup strips. The gas furnaces there, and the few on propane, get the same visit as any Kings Park basement furnace, and a Newington heat pump gets its fall tune-up at that same $99 a system.