Posted on February 1, 2016 by Scott Gibson
J Pritzen's single-story Illinois house was built in the 1950s. It's heated with a gas furnace fully capable of meeting the heating loadRate at which heat must be added to a space to maintain a desired temperature. See cooling load., but somehow it isn't getting the job done.
The single-story brick house has a mostly insulated, but unheated, basement. Warm air is distributed on the main floor by a series of floor registers set near exterior walls, and an energy auditEnergy audit that also includes inspections and tests to assess moisture flow, combustion safety, thermal comfort, indoor air quality, and durability. tells Pritzen the furnace is cranking out 10,000 BtuBritish thermal unit, the amount of heat required to raise one pound of water (about a pint) one degree Fahrenheit in temperature—about the heat content of one wooden kitchen match. One Btu is equivalent to 0.293 watt-hours or 1,055 joules.
more per hour than is lost through the walls and roof.