In New Jersey I had the option of a Cash Rebate or a low interest loan to finance the system. I picked the loan, a ten year unsecured loan at 6%. I plan to have to system paid off in a little over 5 years. The program been expanded since last year, I only got a 2,000 Federal rebate, if I had the system installed in 2009, I could have gotten $4,500 tax credit and a 50% cash rebate, up to $10,000 and a 0% interest loan if estimated heating savings are 25% or greater.