Low efficiency furnaces will remain available to the public, after the US Department of Energy reversed a recent ruling.
They had originally issued a rule in 2011 that all furnaces installed after May of this year would have to have a 90 percent efficiency rating or higher.
However the matter is now being taken up in court, putting the rule on hold.
Chad Bruening with Bruening Heating and Air Conditioning says a smaller number of people use low efficiency furnaces any more.
"The issue is you have some in attics or unconditioned spaces where 90 percent furnaces don't work well for them - so the issue with the ruling is that it may cause those few installations to become a lot more costly," he says.
Bruening says these days, most people go with high efficiency furnaces because of tax credits and rebates, among other savings.
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