I did the mass save audit (of course in mass
) not sure if NH offers this. Got the attic "air sealed" and new blown-in insulation for around 600.00 the whole job was quoted around 2,500 they offer up to 75% savings. Also replaced a 35 yr old Boiler with a new high efficiency model and took advantage of their interest free loan. Last winter my gas bill dropped by as much as the loan is, the Boiler is literally paying for itself right now. Last winter was also very warm so we'll see this winter.