Designed to achieve a low lifecycle cost, Lennox' S-Class packaged rooftop product line is built to help speed installation and maintenance and reduce operating costs. According to the company, Lennox offers the most energy efficient unit in this tonnage category with up to 10.8 EER. The units are available with either R-22 or R-410A refrigerant (select units).

Factory-installed options include integral energy recovery wheels, economizers, demand control ventilation, and variable frequency drives to control operating costs while protecting thermal comfort and air quality. Features that enhance performance and indoor environmental quality include the Humiditrol® dehumidification system, double-wall construction, and high-efficiency MERV 11 filters.