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Addison unit being rigged and lifted on top of the hotel at The Oak in Oklahoma City, OK.

For over 70 years, Addison has pioneered solutions that make the world safer, healthier, and more productive one indoor environment at a time. From inventing split air conditioning in 1952 and establishing seven generations of dedicated outdoor air systems, to introducing our defrost-free heat pump technology, FrostShield, we have an incredible track record of innovation. While our products and...

FrostShield is a revolutionary new mechanical and unit control technology that not only extends the operating range of air-source heat pumps, but also removes the need for the unit to enter defrost mode during heating operation. Brought to you by Addison HVAC.

FrostShield is a revolutionary new mechanical and unit control technology that not only extends the operating range of air-source heat pumps, but also removes the need for the unit to enter defrost mode during heating operation.