"MassSave" is a program i use often in my realestate work because it is as simple as "free money" sitting out their!
The first step is to call and have an energy audit done (a person will come to your house and will replace every light bulb in your home with an energy saving bulb free of charge, among a few other things that take about 30 minutes to complete), once that is done you can then go out anytime after and buy any energy efficient or energy star rated items and qualify for HUGE rebates ($800.00 for furnace or boiler, 300 for H/W tank, among many other things as posted in the link provided below).
keep me in mind if you know anyone buying or selling realestate in south eastern MA!
http://www.masssave.com/residential/lig ... ces/offers