[NCSULandscaper]

it could go either way, if i add a heater it will be a greenhouse, but its considered cold frames...........i guess there would be a difference between ohio and NC, we did alot of pruning on new plants 2 months ago, and have new growth flushing, magnolias are blooming along with forsythia inside the coldframe.........i had to go in the middle of the night to check my guidewires when we had 50mph wind gusts, and temps in the 20s........stepped inside and the air was cool(upper 40's low 50s), touched the floor and the pots and they were just as warm as they could be

here is a pic of one with and without the winter film