“There is an increasing demand for information on the best ways to retrofit and remodel multi-family residences to reduce energy use while increasing comfort and safety,” said Thomas, who has helped establish the concept of “building performance” in local, regional, and national markets. His company works with builders and contractors whose goals include increasing energy efficiency in existing structures.

There's no one "right" answer for everyone, of course. But if you do join an investment club, you will find that there are both "pros" and "cons" involved. Let's take a quick look at a few of these.