@sunkissed no I don't have a heater protection just the light camping blankets over it. Inside the tent but outside the camping blanket the temp is 5 degrees higher and inside the camping blanket is a lot warmer. Not sure if our temp dropped to 36 degrees like the forecast but the temp registered a low of 50 only. I think it is getting the warm draft from our doorwall.
I like your Florida room! I wish I have one like that, then I will not need a tent just blankets but it will be full of plants.
I was surprised to see the frost too but only on my neighbors lawn not ours.