Rebates
All energy companies are now offering very appealing rebates with the purchase of qualifying equipment. The more efficient equipment you buy the more money you get back from the utility companies. Buying high efficient equipment also will drastically lower your utility bills, in most cases the equipment pays for itself within 5-7 years!!!
CFU
https://www.cfu.net/save-energy/residential-rebates/#hvac
MidAmerican Energy
https://www.midamericanenergy.com/content/pdf/ee/ia_res_reference_sheet.pdf
Alliant Energy
http://www.alliantenergy.com/SaveEnergyAndMoney/Rebates/HomeIA/030030