![]() ![]() What size furnace to heat 2,000 square feet? You need a 90,000-110,000 BTU furnace.How many btu do I need to heat 1,500 square feet? It’s 70,000 – 80,000 BTU.How many btu for 600 sq ft? It’s around 30,000 BTU.You can use it to answer the common questions like: This chart begins small – space heater size, not furnace size – and progresses to homes in the average to large size category. Chart of Recommended Heating BTU Per Square Foot You should choose “Average Sun Exposure” and “Zone 5” based on the Climate Zone Map and Sun Exposure Map.Īfter you enter all the data, you will get 90,000 BTUs from the calculator. Your house was built in 2005 with a “good insulation”. Let’s say you have a 2,500 sq ft two-story home in Chicago. Here is an example how to use the above calculator: Make your choice and enter data for each box, and let the heating BTU calculator do the work. The image below shows how much attic insulation your home should have. In other words, the money spent will be quickly gained back through lower energy bills. In fact, the prestigious Remodeling Magazine annual survey consistently shows that attic insulation has a 105% to almost 120% return on investment (Cost vs. ![]() ![]() Money Saving Tip: Adding attic insulation to an attic that is inadequately insulated is the #1 best way to lower your heating bills and get the best return on investment. If you don’t know, if your home is older and hasn’t been remodeled, or if you can feel drafts coming in around windows and doors, choose Poor. 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? The BTU per square foot heating rule of thumb varies widely based on your climate and the size of the house or space you want to heat. Our heating BTU calculator takes those very important factors into account, so, for example, if you have a question like, “how many BTU do I need to heat 1,500 square feet? The quick answer is 60,000-80,000 BTUs based on different climate zones. It is based on the needed heating BTU per square foot for most homes and your climate. Our goal is to help you determine the right size furnace/heater for your heating requirements. How many btu to heat 1000 sq ft? How many square feet will 30,000 BTU heat? You can get more accurate answers thourgh our BTU heating calculator. ![]()
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