Don't know if anyone is still subscribed to this or is still reading but I found a happy medium. Seems to be the ideal solution for me. The Ranco dual stage temp controller. You plug a cooling unit in one outlet, and a heating unit in another. So you're able to create a dead space between the two and run both at the same time. So in essence, it allow me to run the freezer in the summer without the temp dropping too much, but also allows me to run a heater in the winter without it getting too hot. The two units solve the issue of the temperature swings from the other... I'm quite satisfied, especially since its about 75 during the day right now and 40 at night, I can set it and don't have to worry about constant daytime/nighttime monitoring.