View Natural Draft Furnaces Generally Have Efficiency Ratings Of UK. Only condensing furnaces are able to achieve the highest afue ratings of over 90 percent natural resources canada (base graphic). Since efficient furnaces generate fewer emissions, environmental considerations might also the price of a furnace generally rises in step with its fuel efficiency.
Choose between a furnace with a one heat exchanger or a condensing furnace with a second heat exchanger, keeping in mind that a condensing furnace can extract extra heat from water vapor that would usually.
Learn vocabulary, terms and more with flashcards, games and other study tools. Your gas furnace, which is often located in the basement, attic, crawl space or utility closet, may use natural gas or propane as the energy source to create heat within the furnace's heat. The thermal energy is then used to heat spaces such as rooms, buildings, or other structures. Conventional furnaces or natural draft furnaces use atmospheric venting more efficient furnaces get additional heat from the combustion byproducts by using a second heat exchanger to extract more heat.