I don't know that there are any gas-fired furnaces at the 95%+ efficiency rating that are not multi-stage. The one in my old house was 3-stage, and my new one has a 3-stage fan with a true variable burner.
I don't know that there are any gas-fired furnaces at the 95%+ efficiency rating that are not multi-stage. The one in my old house was 3-stage, and my new one has a 3-stage fan with a true variable burner.
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