Jack herer

Its winter so i connected a air hose to my 45watt fan and i blow in warm air, the other side of the hose is right above my gas heater downstairs. The out fan in the tent is on 65watts my tent stays 20celcius and humidity under 50%. I dont think my plants like this “warmed air” as my seedling curl up completely if i put them in the same tent. Its either this or let her freeze. My yield will suffer as it does every winter but hey spring is coming in a few months then its back to party hardy, or grow hardy in our case.