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来自MSN
19 天
Gas Furnace Buying Guide
This is one of the most important considerations, and efficiency can vary considerably from model to model.
来自MSN
9 个月
What Are Furnace Energy Efficiency Ratings?
Today, standard furnaces are 80 percent efficient, while those with a rating of 90 percent or more are considered ... For example, in this article we've been talking about gas furnaces and boilers.
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