Trane 4 Ton 16 SEER Gas System Includes Installation Trane has made its name by setting high standards in the air conditioning industry, their latest products have made their presence known in the market as some of the most efficient and lasting HVACs. One such product in their lineup is the Trane 4 Ton 16 SEER Complete Gas System. Let’s dive into the specifics of its design... $6,690.00