There are a number of yeasts that can tolerate 75. Depending on the style and where you are at in the fermentation. Most Saison beers are fermented in the mid 80's. What are the specifics of the beer? Yeast and style would be most helpful.
I'm having a hard time keeping my beer room below 75 degrees. So, how bad is that gonna mess up my brew?
It'll be flawed.
But you know, we newbies really need to cut ourselves some slack. It's not as though making an error, even a grievous error, is going to result in toxic poisonous swill. It'll be a beer with a mistake; maybe even a beer with noticeable off flavors you can point to and say "yea, that there; that's really not very good is it". But that's not to say it won't be drinkable and even enjoyable in it's own way.
And come on, we're newbies, we can't be expected to hit a homer every time. I have a batch or two that fermented at way too high a temp. They taste just fine... for the must part. But every once in a while I get a sip of something that taste of a sharp medicine-alcohol flavor and I think "ooh, yeah that's nod good". Any way by home-brewing standards I think most would consider that batch a failure. But I don't think anyone would throw it away and I think all would drink it eagerly. I imagine your batch will be a similar "failure". Enjoy the 98% of the sips that don't make you think "yeah, that was a bit astringent" and learn from 2% that make you think "what was *that*" and you'll be fine.
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