Hi Dirk, I remember hearing that the Field Museum in Chicago was experimenting with some solar panels. They've also tried wind power (with the help of a local university), and they did install a new, more energy efficient heating and cooling system. While I don't know if these projects have paid for themselves yet, I do know they were able to get some grant money for them from ComEd (the major Chicago power company). If you are considering alternative energy, there are a number of grants available to help out businesses and non-profits (power companies, EPA) that may make it a feasible option for you. We installed an energy recovery wheel as part of our HVAC system when we built our new Visitor Center last year. I don't have any data on what we've save with it yet, as we've only been in the building a short time. But we did get a grant from the Illinois EPA to pay for the addition of the ERW. Melissa Melissa Wraalstad Exhibit Developer The Morton Arboretum 4100 Illinois Route 53 Lisle, IL 60532 630-719-4888 [log in to unmask] www.mortonarb.org ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).