I have 4 S1s in the garage. I use this to shut them off if it happens to get too warm (and turns them back on when the temperature drops), although it doesn't sound like you will have that problem.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181428692436

It is pollen season now, but they are pretty clean still. I was thinking about one of those big plastic storage boxes where I could truly put them outside, but I haven't spent enough time trying to figure out how to make ventilation water tight and still maintain enough airflow since I do have some windy rain at times. There are NEMA rated enclosures but I'm not interested in spending that kind of money on this little project since it is only really useful in the summer.