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.
Gas furnace sizing chart canada.
Sizing a gas furnace calls for knowing your home and its winter needs.
These factors include the extent of exposure to the sun and the outside air the thickness and type of outside wall insulation the size type and number of windows and outside doors the ceiling height etc.
Typical residential gas furnaces will be available in various sizes between 44 000 btu h and up to 120 000 btu h.
Most furnaces are offered in 15 000 20 000 btu increments so you just need to get close in terms of sizing.
The more space you need to heat the more heat output you ll need to heat the entire.
In addition to weather and climate the size of your home also has a direct impact on the size furnace you ll need.
X 40 heating factor from the chart above 80 000 btu actual output.
If the furnace you selected is more than 10 below your heating requirement we suggest you go up to the next size.
Btu charts furnace output and air conditioner size for a bungalow bungalow area sq ft furnace output btu hr air conditioner size ton built after year 1980 built before year 1980 built after year 1980 built before year 1980 up to readmore.
Use our guide to size up your home to find the perfect furnace.