Trane 3 – 5 Ton 42000 – 60000 BTU 4TXC Cased Coil 4TXCC009DS3HCA with the all-aluminum Comfort™ coil is an efficient unit to accompany your existing HVAC equipment in home. For reduced leaks and minimum operating noise, the cased coil is equipped with a 100% foil-backed insulation.