This has been covered I'm sure, but, since I am a beginner, please tell me what temp. can it remain to ensure proper ferm. I will be using a bathtub that we do not use. Also, I do not run the heat all day to keep the house warm. I'm guessing that the temp varies from 60-75. By the way I live in louisiana and I'm sure everyone knows that the temp. swings can be very volitile this time of year. Last week we had our first snow in quite a few years and in 3 days I had to run the a/c . Thanks for any info. la-boy