Brettmm92, I have a greenhouse with heat but also set up my "makeshift greenhouse," recently.
It is plastic film stretched over pvc pipes covering 2 backyard garden beds, about 180 square feet. Some years, I set up a 2nd hoop house over the neighbor's 2 garden beds with the plastic film attached to a small shed I built on the property line. (That probably won't be necessary this year but I'm still likely to be over there making use of his small garden
My hoop house beds are about half full of bok choy, right now. Those are transplants from the greenhouse. Additionally, there is seed sown for other Asian greens and for escarole. I'll separate that leafy green from the Asian group altho they will all be prepared the same way in the kitchen: some by steaming but mostly by stir-fry. Kailaan seed is sown. That is often called Chinese broccoli and is related. There are broccoli plants back in the greenhouse destined for the open garden. I could move them under the hoop house instead, for an earlier harvest but they are about early enough, outdoors.
The escarole stands up a little better than some of the others to summer heat heat but none do as well as kale and chard. Kale struggles a bit to grow but I learned long ago to harvest it thru the summer and not just wait for it until fall. There are even some 2017 kale plants in the garden now. They have overwintered and we will harvest some of their new growth as about our earliest greens.
The chard seed is being held for sowing in the garden altho we did debate
sowing some of it in the hoop house beds. Maybe we will do that sometime but in 2018 it will be outdoors.
I say indoors/outdoors but the hoop house will only be covering those beds for a couple of months. The plastic film will be pulled off. The greenhouse, on the other hand, will remain "indoors" but I will have that door, wide open during summer days. On hot afternoons, I may even turn on the exhaust fan because things can get real HOT in there! We grew a bed of peppers in the greenhouse last year. That worked real well for them altho the heat delayed their maturing and care was a bit of a bother. The plants grew larger than the same varieties outdoors and produced big crops, by comparison. They were late but had enough time, even though I don't turn on the heat in there though the fall and winter. Yes, of course, it freezes in there.