Lennox MLB Series High-Efficiency, Variable-Capacity, Cold-Climate Mini-Split Heat Pump Lennox is now offering variable-capacity mini-splits with impressive efficiency levels. The high-efficiency MLB 2 Ton, single zone heat pump offers up to 21.5 SEER and up-to 12.0 HSPF and may even help you qualify for energy rebates. Lennox mini-splits also offer other comfort-enhancing benefits. Variable capacity, constant efficiency Unit runs at low most of the time, using only the amount of energy necessary to meet comfort need. ENERGY STAR Certified HVAC equipment with the ENERGY STAR label meets or exceeds federal guidelines for energy-efficient performance. Maximum comfort. Minimum noise Silence is maintained with indoor units that operate as low as 24.5dBA which means they are literally whisper quiet. Our outdoor units operate as low as 55dBA, or the sound of an electric toothbrush. Easy installation and flexible operation Easy to install, versatile and compact. One outdoor unit can pair with a variety of indoor air handlers and support up to four comfort zones to create a personalized heating and cooling solution.