An entirely non-knitting question

So, was talking to one of my co-workers yesterday, complaining about it was so cold on Monday night that even wearing extra layers and bundled under my normally entirely warm enough down throw, I was *still* cold (and too damn cheap to turn up the heat, I added).

He told me that he and his wife had added a humidifier onto their furnace, and that it gently humidifies the entire house in the winter - his point was that it makes the same heat setting feel warmer, but I'm thinking it sounds awesome for a million reasons, since the cold dry air in the winter is murder.

We did some looking today on the vast intarwebs, found that they're not super expensive (in the $200-300 range), relatively easily installable (may need a plumber), have a significantly lower cost of operation, and should work with our furnace (sadly, for many, it only works with forced hot air heating systems).

I'm wondering if anyone out there in Blog-land has used one and has anything to share, good or bad, about them.

Part of me is thinking that if they were as wonderful as they seem, they'd be a lot more common. Part of me is really hoping they ARE all that and a bag of chips.