Cooling With Optional Electric Heat And Gas/Electric Models - 20-25 Tons Standard Efficiency; 15-25 Tons High Efficiency - Roof Curb; Cooling With Optional Electric Heat And Gas/Electric Models - 20-25 Tons Standard Efficiency; 15-25 Tons High Efficiency - Downflow Duct Connections - Field Fabricated; Cooling With Optional Electric Heat And Gas/Electric Models - 20-25 Tons Standard Efficiency; 15-25 Tons High Efficiency - Downflow Unit Clearance - Trane Voyager TC* User Manual