I had the same problem with the CO2 sensor since we are at a high altitude. I now have to use a small electric heater. Fortunately it isn't on at all during the winter daytimes, and only is on a few hours overnight during the winter.
Good luck getting all of your tropicals in, Ric! I'm also moving things to the greenhouse and inside the house in preparation for our cold weather. So far the lowest we have had is 43. Last night was 52,
