Are Calculators Available to Determine What Sized Furnace to Buy?

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Calculators to estimate the correct size of furnace for a given space are available. For example, the website provides a calculator that determines a range of appropriate furnace output capacities for a given application.

The calculator provided by estimates the minimum required thermal capacity of a furnace in British thermal units, or BTUs, given the size of the space to be heated and general information about the types and amounts of insulation present in the walls of the target structure. The calculator also provides an estimate of the maximum thermal capacity necessary to heat the space in question as a guideline for determining if a particular furnace's output is unnecessarily high for the use in question.