You sure you cant get the tank inside? If you're afraid the house cant handle the tank, then I'd be concerned about a refrigerator.....or having more than one person standing in the same room for that matter!
Keeping it outside could end up being a challenge. I'm sure its possible, but there will be a learning curve. For the heat, just moving some air across the water's surface will help cool it off a bit. I use something like this on my tanks in the summer and see a nice drop in temp when I need it: