Adding a wall furnace to your room can open up a world of comfort during the cold winter months. However, if your wall furnace isn't sized properly, you could wind up paying more while remaining uncomfortable.
Use the following wall furnace sizing calculator to help you pick the right wall furnace size:
Total Load Calculations
Cooling Load:
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Heating Load:
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Tell Us About Your Home
Fill out all of the fields provided to calculate your heating and cooling loads. We'll use that information to help you find the right mini split system for your home.
* Required
** For more accurate load calculations, you can edit the detailed information below.
Temperature Details
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Wall & Window Details
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Wall Direction
Exposed?
Width (sq ft.)
Windows ?
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
Glass Doors
Entrance Doors
Wall Direction
Wall Exposed to Exterior
Width (sq ft.)
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
Glass Doors
Entrance Doors
Wall Direction
Wall Exposed to Exterior
Width (sq ft.)
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
Glass Doors
Entrance Doors
Wall Direction
Wall Exposed to Exterior
Width (sq ft.)
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
Glass Doors
Entrance Doors
Wall Direction
Wall Exposed to Exterior
Width (sq ft.)
We assume Windows are 3'x4'. If your windows are larger or smaller, please adjust accordingly.
Glass Doors
Entrance Doors
Ceiling Details
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Enter the height of your ceiling. If you have a sloped, vaulted, or any other type of non-flat ceiling, enter the approximate average ceiling height.
Floor Details
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So How Do I Find the Right Size Wall Furnace For My Space?
A common, misguided way of choosing a wall furnace is to use simple, rule-of-thumb sizing methods like estimating based off square footage.
Unfortunately, there are many other factors that can raise or lower your BTU requirements dramatically, such as your climate, building structure, and more.
Outside of getting a complete sizing estimate of your space, your best bet is using our online wall furnace sizing calculator. Our proprietary software will lead you through some brief, yet specific, questions about your space and provide the best sizing.
Why is Sizing Important?
If your wall furnace is too small, it will run constantly while trying to meet the demand, but never get the room to the temperature you want. The furnace will also suffer from overuse and experience premature damage.
On the other hand, if the wall furnace is too large, you'll probably experience large temperature swings throughout the day, as well as lower-than-expected energy efficiency due to frequent cycling of the unit. This frequent starting and stopping could damage your system over time.
Also, don't forget about the extra upfront cost of buying a larger wall furnace than you need!
NEXT: Shop For Your Wall Furnace