I don't change the temps. Lights on creates some heat of its own so with a heat source from above and below, my plants are nice and cozy. When the lights are off, the temperature drops naturally due to the loss of heat from above. My seedling mats came with a temperature controller that I can set at any temp up to 90F I believe and it will cycle on and off to keep a constant seedling mat temp.The best I can do is to bring it into the garage which looks like is going to happen. The tiny space heater is on the lowest possible setting but still cranking out heat in such a small space is making me nervous. Going to abandon the space heaters at this point and try the heating pad with temperature control to see if that works better with the reduced risk of fire as well. I’ll have to change the temp each morning and night for the lights on/off temperature. Thank you everyone for your help, hoping to get this under control. Regardless it’s been one big learning experience that’s for sure!
You'll still want to run your oscillating fans 24/7 and your exhaust ventilation through something like an inkbird temperature/humidity controller. If your exhaust ventilation is always running you won't retain much heat in your tent whether its in your shed or the garage.