What is a Johnson Air Rotation® System? Heating Specifications for Heating Heating Unit Features Heating Efficiency Comparison Cooling Specifications for Cooling Cooling Unit Features Cooling Efficiency Comparison Heating & Cooling Specifications Unit Features Efficiency Comparison Johnson Air Rotation®  Optional Features Industry-Specific Applications Cooling Efficiency Comparison Using a traditional cooling system, a 375,000 square foot warehouse facility required 22 25-ton commercial grade rooftop units, along with supporting ductwork, roof supports, gas lines and more. Using a Johnson Air Rotation® system required just four units and two air-cooled water chillers-with supporting gas and electrical feeds for the four units only. Original Design 375,000 square foot warehouse facility with gas-fired, package rooftop units Project would require 22 nominal 25-ton commercial grade rooftops scattered around the roof as well as ductwork, roof support, roof penetrations, 25 gas lines, 25 separate electrical feeds, production shut-down for installation and helicopter rigging of each unit. Cooling load estimated at a nominal 550 tons Each 25-ton rooftop utilizes 7.5HP Evaporator fan motor, two 10HP compressors, and two 1HP condenser fan motors Johnson Redesign Utilizing Heating and Cooling Air Rotation® Units 375,000 square foot warehouse facility utilizing four AR105 Air Rotation® units and two air-cooled water chillers. Cooling load estimate reduced to approximately 480 tons of cooling required. Each Air Rotation® unit utilizes only 15 HP per unit plus each unit utilizes a 3HP burner motor. No roof supports, penetrations, ductwork runs required. Site now requires only 4 gas-piping connections and 4 electrical feeds for the Air Rotation® units. Chillers require one power feed, supply and return water piping and associated pumping system. System could have also utilized DX Cooling coils with 4 air-cooled condensing units mounted in a remote location. Redesigned facility requires much less maintenance as equipment is more accessible and there is less equipment. System Horsepower Comparison--Air Movement Only Rooftop HVAC Design @ 7.5HP per rooftop * 22 Rooftops = 165 Total HP required for project. Air Rotation® @ 18HP per unit * 4 units = 72 Total HP required for project. This is an approximate 56% reduction in required air movement work on this project. The Air Rotation® system also reduced required cooling tonnage by 12%.