Problem I got is I'm in the U.K. At the moment it's pretty hot due to our freakish summer we have had but by the end of September the temperature will start to drop dramatically. We use the central heating in the winter to keep the house warm but we don't leave it running all night when we go to bed.
As you said I think the best thing to do is set it up and take some readings and monitor it closely for the next few days.