Well yes i do. In fact I have a coldframe in a hoophouse. I have a minihoophouse in a hoophouse all here at home. I also have 3 24×32 foot hoophouses at the farm. They definitely help but when its 5 degrees its pointless. Right now I'm building a deep winter greenhouse. It's gonna be 32ft by 20ft. Itll have electricity so I could heat it on cloudy days. The heat bank only lasts a couple days without sun and the venting windows frost up so they are hard to close or open automatically. Gonna be a lot of tinkering to get it right. I am building an ag system here where I live not really a csa cuz this is all funded by grants and i don't sell any of the food I produce I just give it away. During the production times I give all my veg to the school and the elderly home then put on a farmers market once a week for about 3 months. The hoophouses are such a pain though. Something is always breaking. They have to have the roof removed during winter ect... our 1st hard frost was early September last year which sucked cuz the the last frost last spring was early June. We literally only had 3 months, 90 days of growing time. I have a grow room set up with 12 4ft 4 bulb lights so I can get stuff nice and big before it goes out but it becomes a big crunch at the beginning thats for sure.