Residential Gas Furnace Sizing

100 000 btu input x 80 efficiency.

Residential gas furnace sizing. From our top of the line evolution system furnaces through the solidly built legacy line of bryant furnaces you can find the blend of dependable heating performance quiet operation and exceptional comfort and energy savings that is right for your home. The lowest efficiency allowed by law for new gas furnaces is 78 percent and some new models achieve 97 percent. Overall efficiency p efficiency within a model group will tend to vary by the size capacity of the unit. Some products like furnaces may also be affected by installation orientation horizontal upflow or downflow or even by the nozzle used in installation as is the case with boilers and oil furnaces.

Residential gas furnaces are available in a number of sizes and are measured in british thermal units or btus per hour. If the furnace you selected is more than 10 below your heating requirement we suggest you go up to the next size. Most furnaces are offered in 15 000 20 000 btu increments so you just need to get close in terms of sizing. Bryant gas furnaces whatever chill is in the air stay cozy with a bryant gas furnace.

Sizing a gas furnace calls for knowing your home and its winter needs. How to estimate a gas furnace size. Next if you need to calculate the output you need on a gas furnace simply multiply its efficiency by its listed input rating for the btu output of heat. Finding the right sized gas furnace for a home often runs into the goldilocks problem some are too large and some are too small.

In addition to weather and climate the size of your home also has a direct impact on the size furnace you ll need. Getting the right one. Understanding furnace efficiency ratings once your carrier dealer has completed a load calculation to determine the proper size furnace for your home you still have decisions to make. How to determine proper furnace size.

Typical residential gas furnaces will be available in various sizes between 44 000 btu h and up to 120 000 btu h. Use our guide to size up your home to find the perfect furnace. A gas furnace made in the early 1970s typically has an afue of about 65 percent. That means the furnace will produce 80 000 btu of heat.

A btu is equal to the amount of. Different furnaces of the same input btu have different efficiencies measured in percentages. For example a furnace with an input btu can have an efficiency of 80. If a furnace is listed with an input rating of 100 000 btu s and an efficiency rating of 80 it would produce.