After running for 10 minutes the furnace will determine it is not keeping up with the need and switch to high fire to meet the heating needs of the home. Both conditions are often caused by very low outdoor temperatures.įor example, when a furnace rated at 80,000 BTU's first turns on it will operate at 60,000 BTU's (75% of 80,000).
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1) The time the furnace has been operating or 2) if the thermostat control senses it needs to raise the temperature more than one to two degrees.Īt that point two stages of heat will fire, blower will increase slightly and the furnace will run at full capacity. The furnace will automatically switch to second stage (high fire or high power) based on one of two conditions. In most models, the low setting will also run the blower at a lower speed as well. When a furnace initially turns on it will start in this low fire mode. It will run between 70-80% of the rated capacity of the furnace. The first setting is called First Stage (low fire or low power). Two-stage heating describes a furnace with two settings of heat output.
You'll find it quite different from what salesmen are telling you. Often these salesman wax poetic about how much energy bills will go down and the two-stage heating will pay for itself.īut before you choose, I'd like to give you my real world experience with these furnaces. The first time we even hear the option of a two-stage central heating system is usually from a contractor's salesman.
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