What efficiency is your furnace?
If you are you unsure of the efficiency of your furnace go take a quick look at it. If the flue pipe coming out of it is metal, it is standard efficiency. If the flue pipe is PVC, you have a high efficient furnace.
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If you are you unsure of the efficiency of your furnace go take a quick look at it. If the flue pipe coming out of it is metal, it is standard efficiency. If the flue pipe is PVC, you have a high efficient furnace.