Coleman® brand DL/DU Series rooftop units provide commercial, packaged heating and cooling. They are available in 61/2-, 71/2-, 81/2-, 10-, and 121/2-ton capacities. Configurations include cooling only, cooling with electric heat, and cooling with gas heat and heat pump. Gas/electric units perform in two-stage heating operation, with 60% capacity at first stage and an additional 40% at second stage. All units feature two compressors with independent refrigeration circuits. They can be installed on a roof curb, slab, roof rack, or frame, due to a single-footprint design, says the company. York International Corp., Unitary Products Group, attn: Dave Trautman, 5005 York Dr., Norman, OK 73069; 405-364-4040; www.york.com (website).