Available in the 15- to 25-tonnage range, all-new Trane® Foundation™ light-commercial rooftop units feature a unique dual-footprint design that can directly replace up to two-thirds of existing units without adaptor curbs and are available for rapid delivery. The unit features durable components that have been tested in the field — including a long-lasting tubular heat exchanger, reliable gas ignition system and proven compressor technology. Click on photo to see video. (Video courtesy of Trane.)