What Size Furnace For 1200 Square Foot Home

Most homeowners know that installing a furnace isn t a diy kind of job but you might be surprised to know that merely sizing a furnace requires some special knowledge.

What size furnace for 1200 square foot home. For example a 50 000 btu furnace with an efficiency rating of 80 percent provides a 40 000 btu output. The effective btu output which is based on its efficiency rating is a percentage of the btu input rating. Keep in mind however that this is just a starting point. That s because choosing the right furnace isn t as simple as looking up a home s square footage on a chart.

But before we buy an 80 000 btu furnace there s furnace efficiency to consider as well. Factors such as construction type building date quality of insulation quality of windows and doors and the number and size of rooms are used to determine the exact size of furnace. Thanks to the equation we know we need 80 000 btus of heat. 45 000 to 90 000 btus.

36 000 to 72 000 btus. For this example using an 80 efficient furnace the 1900 square foot home above would require a 90 000 btu input furnace that produces 72 000 btu s of heating which is close enough to the 76 000 btu s required using the climate heating factor. Most 1 200 square foot homes needs a furnace with an effective output of 40 000 to 50 000 btus. With a manual j report in hand you ll know exactly how many british thermal units btus of heating and cooling you need for your home.

Below are the btus required for homes of certain sizes. If you get the sizing wrong. What size furnace do i need for my home. The first factor you should consider is your home s square footage.

2 000 square feet x 40 btus 80 000 btu output required. You can also get a rough estimate by looking at the square footage of your house. You need to purchase the right size furnace to heat your home effectively and manage your energy costs.