There's been a comment on Green Dryer post that y'all might like:
You can find a nice version of this along with a custom base that raises the height of the dryer at:Thanks, Owen. Good timing, too - winter is coming.
First thing I would be concerned about before you reach for your wallet, though, is the smell that will get in if you're using scented sheets in your dryer. It is not really noticeable inside of the house, but I can tell you that if you walk down the street when someone's dryer is working, you can smell it from over a hundred feet away.
An easy test for that would be to move your drier away from the wall, disconnect the air hose and turn it on like you usually do - you'll know right away whether you'd be willing to tolerate that smell in the house or not.
Another consideration is that there will be some heat dissipation that you don't need during hot summer months. Relatively easy to deal with - it's not that big of a deal to reach behind the dryer and reconnect the hose directly to the dryer vent, especially keeping in mind that you have to clean that space couple of times a year anyway.
If that's the case, though, then I wonder why not just simply disconnect the hose from the dryer and let it be.
And, last but not least, the amount of lint and debris that comes out of the dryer is significant even with the stock dryer filter in place and cleaned before each run - if you're allergic, you might think twice about directing exhaust air into the house.