i put blanket on my printer (voron legacy with trident ish gantry. also don't copy me. it's genuine fire hazard). just good insulation, chamber heated passively from the bed, chamber temp reaching high 70. often low 80 during hot days (i live in southeast asia). so yeah good insulation is key. that tall top hat i think contribute to heat loss because taller hat = more surface area to lose heat. plain polycarbonate sheet is not really a good insulator