You are thinking of Joel Salatin.
The thing is it isn't exactly a greenhouse he uses, and it is still IMO not the best situation for the chickens.
Chickens are very susceptible to heat (they have a lot of trouble over 90-95 F especially when humid) and in winter a humid atmosphere tends to cause frostbite at not-very-cold temperatures (whereas well chosen breeds are quite cold hardy in DRY air). Also huge daily temperature swings in winter are not great for them either.
If this is like a hoophouse thing that you can have one or both entire ends open, you *might* be able to get it to work acceptably well, with sufficient extra summer shade; but it is not the ideal or easiest setup.
Good luck, have fun,
Pat