Check a few different spots in your home - closet, a room with a tile floor, etc. - and see if your have a place with something lower than 80. Temps are going to be higher toward the ceilings. If you can't find a cooler spot in your home, then consider leaving the humi at work, if they keep it cooler there. I've done this before.

I've also used those "blue ice" things that you freeze and then put in a small cooler in lieu of ice. Two of them in a 42 quart igloo will keep it cool for a couple of weeks, provided you're not opening it all the time. But, you have to get a cooler to do this, which is a pretty good idea. Wrap any blue ice you use with a wash cloth or hand towel to take care of condensation issues.

There are also cooling systems available if you can fit them on your budget. Some people have used wine refridgerators and it sounds like they work pretty well. Search around I think here and on the net and you'll find some conversions.