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 Heating and Air Cooling with Air Rotation® The Johnson Air Rotation® System delivers heating, cooling and ventilation capabilities. A single unit can condition a space of 100,000 square feet, maintaining temperatures and humidity within one degree and one percent relative humidity. Please review the Heating and Cooling sections of our Web site or contact us for more information. CustomerService@johnson-marcraft.com