Redfin announced that it was partnering with energy software vendor WattBuy to add estimated energy usage data to house displays, according to a press release. Consumers "can now use Redfin to better understand the costs of living in a home, including utility bills that can be tricky to predict but meaningfully contribute to a homeowner's total monthly costs."

Tying energy and environmental considerations into property data is becoming more common. LightBox is working with First Street Foundation to incorporate climate risk information in the former's products. CoreLogic has its climate risk analytics, Cervest has a climate risk rating system for physical properties, and AiDash has a carbon measurement tool for corporate land holdings. And then there is the myriad of software and hardware products to monitor and manage energy use in commercial buildings.

But there doesn't appear to have been anything that even goes down that road a bit for consumers looking at houses. Frankly, most people aren't going to look at an abode as a combination of carbon costs that need summation. But energy use is a reasonably proxy for a significant portion of carbon emissions. It also happens to be a cost people might want to consider when buying a home.