Just give them a nice warm pouch with a lot of fleece blankies. I have a tendency to walk up and gently place my hand on the outside of the pouch for a few seconds...if they are cold, they will shiver...just like we do...you'll feel it, then you can adjust accordingly.
And I have to say one thing about "the wild." Magdals, I'm not picking on you, your comment just gives an easy opening for my comment...so when I say this it's not just about temps in the wild, it's about food and all of the other multitudes of "wild" comparisons many make....
Yes, the temps in Australia and Indonesia fluctuate from hot to cold, just like they do here...and yes, the wild animals adapt to this, just like they do here...BUT, we need to remember it is adaption.
Sierra, if you've always had your room at these temps from the time you brought your babies home, I would say, they are adapted to this and are just fine.
But just because a wild glider can handle a cold Austrailian evening, doesn't mean it won't make our domesticated, pampered gliders a bit uncomfortable.
Let's use Huskey dogs as an example. In Alaska some are bred to pull sleds...they are housed outside and kept warm by a flimsy dog house and some hay for bedding. Pups are born and housed the same way.... they are used to it; have adapted to it.... but if you have a Huskey for a pet that has been an indoor dog it's entire life,....you wouldn't be able to drop it in the middle of an Alaskian winter and expect it to survive.
So anyway, that is my little schpeel about domestic VS. wild. Yes, they have a certain lifestyle in the wild, but our babies aren't wild. They are exotic, but not wild.