My water during the winter months usually stays between 65F and 72F. There's no heater in the tank. During the peak summer months, the temperature can rise, entirely on its own, to 84F or higher. Of course, I only keep coldwater fish or those tropicals that can adapt to the cooler temps (like zebra danios).
I lost a batch of red cherry shrimp this last August because I went out of town and the water rose to 84 (and possibly beyond, as my thermometer doesn't show a higher reading). I can't afford a chiller, and when I'm not there, I can do nothing to keep the tank cool.
With the exception of the RCS, all inhabitants are extremely adaptable.
Didn't bother my Anubias, though. As you can see, it's thriving.
I love my Dojos; my Dojos love me,
As long as I feed them, happy they'll be!