Exterior low temperature rating for cold weather. Operates until how cold outside?

Thank you for your question. This unit efficiently heats with outdoor temperatures as low as 5 degrees Fahrenheit and with temperatures as high as 75.2 degrees Fahrenheit. It efficiently cools with outdoor temperatures as high as 109.4 degrees Fahrenheit. Also, Perfect Air is an air conditioning system supplier in Countryside, Illinois. For more information about the company, including place of manufacture, please contact them directly at (866) 996-9255 or by emailing info@perfectaire.us. For more assistance, please give us a call.