[Bob I]

Originally Posted by Delphinus

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.




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.

I don't know if some facts would be of assistance to you. I don't know if you realised that warm air can hold much more moisture than cold. That should lead to the explanation of condensation on windows during cold weather. The moisture in the air condenses out when the warmer air runs into the cold window. It is very helpful to have a small fan blow air past a cold window. That is a relatively inexpensive cure. (always depending on the number of affected windows).