Why? So many possible reasons. People who care about efficiency are by definition long-term thinkers. They think about the future. They make plans.
But also, people with efficient homes have lower carrying costs. Because banks don’t yet consider carrying costs in such detail, banks don’t give buyers credit for the money a low heating bill puts in the owner’s pocket. So efficient-house buyers are “richer” than banks can conceive.
And efficient homes are more likely to be bought by people with flexible mindsets, who aren’t puzzled by freakishly small furnaces, multiple fuel sources, heat pumps, heat sinks, geothermal gizmology, thick walls, and other peculiarities of green building. Flexible thinkers are also more likely to find a creative way out of a financial crunch, according to me.
This jives, oddly enough, with a study I saw yesterday linking pro-environmental behavior with the personality facets, Openness to Experience, and Conscientiousness.