After Katrina, we were out for a month. It had to be our hottest September ever - - upper 90's every day. Burned a ton of gasoline keeping a portable generator going. And yes, we added a 15 kw propane unit a couple months later. Nothing like closing the barn door a little late.
And, we were out for 4 days after a snow in 2008, but my generator cannot handle heat. Luckily, my woodstove works well.