This does not seem that weird, but I am having trouble finding a solution. Suppose the power goes out overnight in Ohio in January. I wake up, and in theory my gyres are running off the battery backup, but the temperature drops precipitously. I want to slow that drop. So, I want to have a heater set to turn on at, say, 76 degrees, hooked up to a battery backup. I don’t care if it only lasts 1 hour. 1 hour slows the fall and probably helps. So, assuming that, what heater-backup combination works best for that?