EHC and EHC Plus: Monthly payment available on systems less than 13-years old. Major parts coverage of compressors, condenser and evaporator coils includes installation and parts coverage under original manufacturer’s warranty. Optional maintenance accessory coverage is available for humidifiers and air cleaners. Geothermal and boiler systems are not eligible under either plan. See EHC Terms and Conditions for complete details. Sales tax in some States.