Auto orange bud greenhouse early start

It says your growing in a green house so it's probably going to be pretty difficult to ensure your plants don't freeze in the winter my friend. Especially cheap. All I can think is insulation and reflection like Mylar to increase the light concentration and hopefully the heat. Other than that I would move them inside and get a tent and a Led going asap. Few hundred bucks and you won't worry ever again. Hope this helps.