Mitsubishi 18,000 BTU Commercial Wall Mounted Single Zone Cooling Only System (PKA-A18LA.TH & PUY-A18NKA7)Mitsubishi's commercial 18,000 BTU 19. 8 SEER wall mounted single zone cooling only system (PKA A18LA & PUZ A18NKA7( BS*)) is part of Mitsubishi's P series. This single zone unit is perfect for server rooms, electrical rooms, elevator machine rooms, and other business and commercial applications where you need cooling 365 days a year. This 18,000 BTU wall mounted single cooling only system provides low ambient cooling down to 40Fahrenheit providing