Or just open part of the hood, maybe take the back panel off, or even open the front if necessary. Or lower the water level a bit.
I don't worry about 80 degrees, 82 or 83, maybe.
Also, you can set the heater to raise the minimum temp a bit if you wish, so the temp swing is from 78 to 80, for example -- again, I wouldn't at this point, but much over 4 degrees might become an issue.
Remember, the tank temp will depend on ambient temp in the house. In my house, summer temps are 80, the tank will be a degree higher typically.