I am north of Atlanta, GA and have a similar issue. My pool is a little over 16k gal., plaster but I'm using chlorine. Air temp at night drops to low 40s sometimes, and my freeze protection was kicking on. A few weeks ago, I wrapped the air temp sensor in a small towel, stuffed it into a beer koozie, and then put it inside the control panel. This fixed my issue, every time I checked the air temp sensor after doing this, it was within 1 or 2 degrees of what the actual air temp was... until this morning. Air temp outside was 48, and my freeze protection was on. I went out, and as soon as I moved the air temp sensor, it turned the freeze protection off. I'm wondering if that sensor is just going bad. Did swapping out your sensor fix your problem? BTW, your name 6XSBChamps, which team?