The Retrovent™ Replacement Program simplifies replacement of aging 20-ton and larger air handlers with energy-efficient, direct-match units, avoiding extensive renovation costs. According to the company, the program makes it easy to upgrade IAQ while reducing operating costs and increasing occupant comfort. The replacement product line (R-Series) precisely matches existing roof curbs and supply/exhaust connections to minimize the cost of roof and building renovation. Replacement air handlers incorporate technologies to reduce operating costs including direct drive variable-speed fans, optional variable-speed compressors, and modulating gas or electric heat. DDC programmable controls are included for improved scheduling and communications with existing building systems. Dedicated experts help to simplify product selection and reduce the complexity often associated with ordering and installing replacement units. Optional program features include lease-to-own-financing, recycling of the old units, installation of the new equipment, and start-up services.