Has anyone tried to use a heat exchanger of any kind on their dryer vent, or better yet, is there any commercially available product to do this? I have a gas dryer so simply venting indoors likely isn't a good option, as welcome as the extra humidity may be the few months out of the year that I'd actually want to do this.
I realize that it's probably inconsequential in the grand scheme of things, but it does seem wasteful to heat all that air and then just blow it outdoors when it's 20 degrees out.
I tried to do a quick online search, but all I saw was a little discussion and not much in the way of actual plans, products, or results.
nate