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Originally Posted by Invigor
I tell ya it was a kick in the pants to find out our new furnace has a 110v fan instead of the variable 3 speed DC fan I -thought- was coming with it...grr. I think the AC fan motor uses 6amps...so that's the same as running 2 250w MH ALL DAY LONG!! huge bill 
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I kind of wonder if it's possible to retrofit a DC drive in a furnace. My house is 2 years old now and had I known about the difference in DC vs AC drive fans when the house was being built I might have tried a little harder to come up with the extra few grand the housebuilder wanted to upgrade to a high-eff furnace. At the time it just seemed like too much investment for only marginal improvements.
I asked the guys doing my HRV install about that (retrofitting a DC drive fan) and they told me that by the time you added up all the factors, that you "might as well just go to the whole new furnace." Of course, asking someone who's livelihood depends on people buying furnaces might not give you the most unbiased answer, so I haven't really given up on that notion for now, might look into it again down the road.
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But, we also bought an HRV unit, just has to be installed. I'm really looking forward to it.
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Same situation for me. I've had the unit half-installed for nearly a week. The guy came back yesterday and although he's STILL not finished with all the ducting work, it's enough done that it can be turned on and I have to say, what an amazing difference. After about 6 hours, my house had dry windows (every single window) for the first time since the warm weather (it's only a problem when it's cold).
Of course as luck would have it, now that it's operational, it looks like we're heading into another warm spell for a few days, so I won't really know for sure until it gets cold again. But I have to say, I'm pretty excited about the potential here.