Deliver year-round comfort with a 3.5 Ton (3 1/2 Ton) Split System Air Conditioner matched with a Gas Furnace and Cased Coil. Designed for homes and spaces between approximately 1,800 and 2,100 square feet, these systems combine powerful cooling with efficient natural gas or propane (LP) heating. Choose from furnaces rated 80% to 96% AFUE—meaning only 4% to 20% of fuel energy is wasted. A 3.5 ton gas split system provides reliable, energy-efficient performance season after season. Family owned and operated since 1992, we offer fast shipping, free duct designs, transparent pricing, and expert warranty and technical support.