The first couple of years in the new house, Linda and I overwintered our plants inside. The problem was they took over the kitchen and the family room. It took forever to water, we could never keep the humidity up and many of the plants were pretty unhappy. Then we built our Garage GH - PVC pipe, plastic sheeting and duct tape; completely within the garage. At first we used cheapo flouescents but have since graduated to an 8 bulb T5 fixture. It works fairly well. We liked it so much we added a water feature!