dealing with heating guys who come in and buy the pipe fittings for the hi-efficiency furnaces all the time they have said that you can have the biggest and best furnace in the world but if your house doesn't have properly located cold air returns and the ducts aren't "ran correctly" your house will always be cold.
It is a misconception that Lennox is the best name out there as well. We are building a house and went with a Carrier 92.5% efficient furnace
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