Josh,
It was much harder a month ago - it could go from 55-95 in a couple of hours once the sun started hitting it completely. Over the last month-six weeks, lots easier. For sure, it the overnight lows are 28 or above, I don't have to worry about lighting the kerosene. If they are not predicted to go below 25, I keep an eye on the indoor temp and as long as it is such that if I lose one degree indoors for every degree the outside temps drop and it will stay above 52, I don't worry.
Usually by about 11 am I can turn the kero off and turn a fan on. Humidity is a problem (I installed the AC plastic backwards) and it's easy to get a white mold on the leaves. I also trim off any bottom leaves that are turning yellow - they make good compost. If the outside temps get above 35, I turn off the heaters, above 40 and sunny I open the door a crack. Usually by 4 pm I have to close it but most days I'm home by then or shortly after. Leave the heaters off until the temps get in the high 50s, then depending on the forecast I can run 450 watts, 600 watts, 1050 watts or 1250 watts. I'll usually turn the fan off when I turn the heaters on or when the sun goes down.
Because of the low light this and last month, I'm trying to keep the gh cooler and not watering the plants as much. They still get a bit leggy (at least some of them) but I can top the ones that get too tall. I'm resigned to not having many ripe toms until February, though I should have more than enough to eat in another week or two.
Next year, I'll close it down toward the middle of December and leave it empty until the middle of February.
Mike