Quote:
Originally Posted by Fuzz
I had a new high efficiency furnace put in about 10 years ago, and they did run a fresh air supply, but it is on a damper that only opens when the furnace is on. I thought most of the good setups ran this way, otherwise you are just dumping cold air in the house all the time.
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To be fair, the cold air doesn't really dump in unless the nice warm air is being asked to leave (exhaust fan, combustion), so it isn't as bad as you'd think.
Plus with older homes (ie not that long ago, say 10 years), you'd have both the combustion air and the fresh/make-up air lines open all the time. So I'd argue most homes are still like this. Only with the advent of the fancy pants units that pre-warm the make-up air and the controlled dampers on combustion air do you not have a source of chilly air open all the time.
High eff units are even more skookum as they draw and exhaust without ever dealing with the air in your house.