We have elaborated on winter heating requirements (in BTU) and heating factor here.īasically, BTU stands for British Thermal Unit. Furnace BTU Calculator (Input Square Footage And Climate Zone)Įssentially, homes in the far North (Minessota, for example) need almost twice as much heating load as homes in the far South (Texas, for example).
Use this map to determine the climate zone (or climate region) you’re living in: 5 US climate zones: Size of the furnace heavily depends on where you live. You can freely use the calculator to roughly estimate the capacity of a furnace you need. What size furnace do I need for a 3000 sq ft home? (Example 3)īelow you will also find a chart with calculated BTUs and furnace tonnages for houses from 500 sq ft to 3,000 sq ft.What size furnace do I need for a 2000 square foot home? (Example 2).What size furnace do I need for a 1000 sq ft house? (Example 1).You only need to know two things your home square footage and the climate zone you’re in.Īfter the furnace sizing calculation, you’ll find how the size of the furnace is calculated. To help future furnace owners out, we have developed a simple furnace sizing calculator. Fortunately, calculating furnace size (be it natural gas, propane, or oil) is not rocket science.
Most homeowners have difficulties figuring out what size of furnace do they need.
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