Do you have any green features in your house? If so, you are part of a trend.
Having systems in place that are eco-friendly isn't anything new. But using these as a marketing tool is gaining popularity in Central Pennsyvlania.
Case in point --- just today I noticed that there is a new section on the form I fill out when putting a home in the local Multi-List database that Realtors use. These items are added when there is a demand --- and people have been asking about solar panels, programmable thermostats, and rain barrels. The photo above is a snapshot of what I ran across today. Unfortunately I couldn't check any of those items off!
On a side note, I'm not sure how a radon system or gutter guards are "green", though they are certainly important :-)