An Introduction to Two-Stage Furnaces and How They Work
When looking at having your furnace replaced, there are a few important factors to consider. This includes the overall efficiency rating of the furnace as well as whether it is a single- or two-stage or variable-speed unit. To help make your choice easier, here is a full overview of two-stage furnaces including how they work, how they compare to other options and what benefits they can provide. How a Two-Stage Furnace Works Most gas furnaces are single-stage units, which means that they can only run at full power. Whenever the unit is on, the gas
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