Just read some TR stuff. Seems except for the cheaper trainers, it should be fine.I know I'll be fine, but will calibrating in the heat affect using the trainer in the cool. I'm trying to avoid having to calibrate it before I train in the morning. I'm assuming it'll have a temperature sensor in it so it'll be irrelevant.
I normally do a calibration after a 10 or so minute ride, to get the trainer warmed up. But after reading some of that stuff, I might be more inclined to do calibrations after a workout. Then the trainer is truly warmed up, regardless of ambient temperature.
Just do a calibration spin down after you've done your first workout, and you will be peachy.