Up to a point, it's not the temperature that's a problem, but the speed of the temperature change. The guitar case is the best way to protect your guitars from that. Example: going from a cold truck to a warm warehouse for example, I'd leave them four or five hours before opening the case. In your home the temperature changes won't be too fast so they'll be fine.
Storing them in their cases is a good idea and don't leave them anywhere you would not be comfortable, e.g. don't leave them sitting in the sun or in a car on a hot day, or under the roof or attic where heat builds up. If they get too hot, the glue will start to soften and you could have big problems but that's gonna be over 120F with high humidity, or even higher temps with lower humidity, so not something you should need to worry about. Feel free to play them and adjust the truss as and if necessary. All will be fine.