First of all.. that's a grow hut/tent/rack. The difference is you can walk into a greenhouse. But one benefit of owning a grow tent is you can keep it in the house and control every aspect of it's climate, light, heat, humidity.. etc. etc. If I were you, I would put it in the house all year round, add some lights to each rack, maybe a fan, some trays of water under the plants to keep the humidity up.. and boom, a completely controlled grow environment.
Nice addition.. your CP's should love it.