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WHAT SIZE WALL FURNACE DO I NEED? Wall Furnace Sizing Calculator. A wall furnace can be a great way to heat your room, but not if it's improperly sized. Use our wall furnace sizing calculator to get a detailed sizing estimate for your space. How do I size a wall furnace? Just use our easy-to-use tool!

What Size Wall Furnace Do I Need?

Wall Furnace Sizing Calculator

Product Expert
What Size Wall Furnace Do I Need?

Adding a wall furnace to your room can open up a world of comfort during the cold winter months. But, if wall furnace isn't sized properly, you could wind up worse off than before!

If your wall furnace it is too small, it will continuously run trying to meet the demand, but never get the room to the temperature you'd like. It may also suffer physically from the extra usage it experiences while running for so long.

If it is too big, you'll probably experience large temperature swings throughout the day and worse energy efficiency than expected as your unit cycles on and off too frequently. The frequent starting and stopping could damage your system over time, as well. And don't forget about the extra cost upfront for buying a larger wall furnace than you need - you'll feel that before it's even installed!

So how do I find the right size wall furnace for my space?

A common, misguided way is to use simple, rule-of-thumb sizing methods, such as square footage, to size your wall furnace. 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 estimate you'll find from any online tool.

Wall Furnace Sizing Calculator >

Need a More Precise Measurement?
We're here to help you get the exact product for your needs. If you need a sizing calculation more precise than what our online tool provides, give us a call at 866-554-4328 and our engineers can provide a complete, professional sizing for your space at no cost to you.

Because of the detailed work involved, these sizings take about 3-5 business days to complete. To get a head start, please fill out our sizing worksheet and send it back completed to or by fax to 1-866-554-4365.

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