[0xdeadbeefbabe]

> every house to have a food-grow room

The climate in our house varies so much that we need a heater in the winter and a cooler in the summer to keep it habitable. An additional grow room for plants would require the same and the cost would seem to outweigh the benefits, although I'm willing to be convinced otherwise.

[ph0rque]

Check out the Ground to Air Heat Transfer tech in the Ceres Greenhouses link. It acts as a temperature stabilizer while using very little energy.