yournamehere

Fescue can't take 90 degree temperatures, despite your "professional's" advice.
I was going to guess you have bermuda in front (especially since you mentioned it was sod). But bermuda requires even more water than fescue, so it doesn't make sense that it's thriving with no water, unless you're getting a lot of rain. Of course, that's one of the good qualities of clay - once it gets saturated, it retains moisture for a long time. Did it turn yellow or brown in the winter? If so, it's bermuda. When you get down real close and look at it, is it a nice, even "carpet;" or are there clumps of grass with spaces in between? If it's the latter, and stayed green all winter, it could be St. Augustine.

If you decide to put bermuda in back, you can't buy seed; you'll have to buy sod. It's more expensive but a lot easier not worrying about the grow-in period. You'll also get an inch or so of better soil with it.
You might be able to still buy Common Bermuda seed, but you'll really want a hybrid, which is only available as sod - otherwise you and all your neighbors will be sneezing till the first frost. Common Bermuda is very allergenic.

If you want some real professional advice, call your local golf course and ask to talk to the superintendent, or his assistant. They can tell you in one minute the best grass for your area's climate, how much to water, and when and how to fertilize it.

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