Overview of Furnace Types: Single Stage, Multi Stage and Modulating Furnaces
In this article, we take a look at the various types of forced-air furnaces, and compare the difference between single stage, two stage, variable speed, and modulating furnaces. Single Stage Furnaces What is Unique About a Single-Stage Furnace? A “stage” are the different speeds that a furnace runs. A single stage furnace is essentially ON …
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