It is now code, so if your home doesn’t have it, vapor barrier/wrap will have to be installed the next time you replace the siding.Īre the windows and doors newer and in good condition? If you answer “yes” to the house wrap and window/doors questions, then choose Good or Average in the Insulation box. In terms of being sealed, is your home’s exterior covered in house wrap like Tyvek? It’s also called vapor barrier. Insulation: There are two keys to insulation – How well your home is sealed and the type and thickness of the insulation. If you don’t have any of those, the easiest way to determine it is to measure rectangles within your home – multiplying width x length for each if there are more than one – and adding their totals.ģ. If you don’t know it, the information might be found on a blueprint or house drawing, in closing documents or similar. Home Size: Enter the square footage of your home. Pro tip: If you’re on or near the border between Zones, choose the higher number/cooler Zone.Ģ. Climate Zone: Find your location on the map. Heating BTU CalculatorĬalculate heating BTU needed in four easy steps.ġ. We mention that to represent it as accurate and very useful for our purposes. It was developed by the International Code Council / International Energy Conservation Code and adopted by the US Department of Energy’s Office of Energy Efficiency & Renewable Energy. If you’re living in New York, a 75,000 BTU furnace would only heat a 1,500 sq ft home. There are factors other than climate, and they are used in our heating BTU calculator below to give you the most accurate information.Įxample: With 75,000 BTU heater, you can heat a 2,500 sq ft house in Florida. This list showing heating BTU per square foot is taken from our PickHVAC Furnace Ultimate Guide: That’s a wide difference, essential one furnace being twice as large as the other, so the size factors are discussed to help you narrow down the right BTUs needed for your home. The generally accepted BTU per square foot heating rule of thumb ranges from 30 BTU to 60 BTU per square foot. Rooms furthest from the heater might become uncomfortably cool spots in your house.Ī furnace that is too large will waste energy and create warm spots at grates near the furnace before the cycle ends. A furnace or space heater that is too small won’t adequately heat your home on the coldest winter days. That’s an important question to get a right answer to. How Many BTU of Heating Per Square Foot Do I Need? What About Wood Stove/Boilers and Combi Boilers?.How Many BTU Do Furnaces Make? Standard Boilers?.How Many Square Feet Will 4,000 – 80,000 BTU Heat?.Chart of Recommended Heating BTU Per Square Foot.Calculate heating BTU needed in four easy steps.How Many BTU of Heating Per Square Foot Do I Need?.
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