A Single Stage Gas furnace system is the right HVAC solution for many homeowners, and so, the Trane RunTru 4 Ton 15 SEER 47500 BTU 80% Single Stage Gas Furnace System is suitable for those looking for a gas system with an efficiency of 15 SEER. The individual components of this system are as follows: (1) Trane RunTru 4 Ton 15 SEER A4AC4 Series 48000 BTU Single Stage Air Conditioner Condenser. More Info: https://greenleafair.com/product/trane-runtru-4-ton-15-seer-80-gas-system/