TDF - check out MassSave,
I haven't done this myself, so sorry ahead of time if I send you on a wild goose chase, I can only hope you are at work are getting paid for it.
There are rebates free for the taking when buying a furnace, I think you can get up to $500 back.
(
http://www.mass.gov/?pageID=ocatermi...dent&csid=Eoca )