Product Overview Standard efficiency, variable-capacity, mini-split ductless AC Lennox is now offering variable-capacity, variable-speed mini-splits with impressive efficiency levels. Variable capacity, constant efficiency Unit runs at low most of the time, using only the amount of energy necessary to meet comfort need. Maximum comfort. Minimum noise. Silence is maintained with indoor units that operate as low as 20 dBA which means they are literally whisper quiet. Our outdoor units operate as low as 53.5 dBA, or the sound of an electric toothbrush. Easy installation and flexible operation Easy to install, versatile and compact. One outdoor unit can pair with one indoor air handler to create a personalized cooling solution.