I wish I had a place to grow inside. Both bedrooms are being used, the den is used everyday, and the kitchen living room and dining room are all basically one big room. There is space in the garage but I think it would be pointless, the air temp in the garage is about the same outside during the winter and about 10-15 degrees higher in the summer. I get all that free sunlight outside, so basically it seems pointless to spend the money to run
lights and still need to deal with the weather to grow in the garage.
I have plans to build a greenhouse, though not any time soon. It will be easier to heat during winter, and I will build it in a way that it wont get hot from the sun in the summer. So hopefully one swamp cooler and one window ac unit will be enough to cool it during the summer, of coarse that depends on how many square feet I build it. I will still be able to use natural sunlight year round, maybe some supplemental lighting during winter.