Celebrating 40 years in business! Energy Saving Products Ltd., proud manufacturer of Hi-Velocity Systems, is a family owned and operated manufacturer of quality heating, air conditioning and air purification products. The Hi-Velocity System is a Small Duct Central Heating & Air Conditioning System, suitable for historic remodels, retrofits, new construction, recreational properties, and commercial applications. For multiple unit applications (apartments, townhomes, duplexes/4-plexes etc.), the Builders Series is an excellent cost and time-saving option, available exclusively for multiple unit new construction applications. Designed to fit where other systems cannot, with superior indoor air quality and climate control.