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The size of a furnace is based on how much heat it can produce in an hour, as measured in BTUs, or British thermal units. A BTU is the energy required to heat a pound of water by one degree Fahrenheit. The higher the BTU rating a furnace has, the more warmth it can provide..

The first factor you should consider is your home’s square footage. Bigger homes, generally speaking, require more BTUs to heat.

900 to 2000 sqft house: 60,000 BTUs

2001 to 3000 sqft house: 80,000 BTUs

3001 to 4000 sqft house: 100,000 BTUs

4000plus sqft house: 120,000 BTUs

Buying the right size furnace for your home will ensure you’re comfortable and don’t spend more on heating than you need to. Oversized and undersized heaters, on the other hand, will both cause you a slew of problem

Some may assume an oversized furnace will ensure their home stays warm, but this is not the case. A furnace that is too big can lead to the following problems:

•You’ll feel uncomfortable.

• Less energy efficiency.

•Short lifespan. Constant cycling

• You will have to repair it often.

If your furnace is too small, you’ll also run into several problems, many of them the same:

• You’ll feel uncomfortable.

• High energy bills.

• Short lifespan.

•Uneven heating.