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garage info: 1,000 sq. ft. block/stucco with 9 1/2' ceilings Trane XR12 2TTR2030A R22 2.5 ton (30,000 BTU) A/C external unit attic mounted air handler 3 supply lines using 8" I.D. flexible ducting to 7" x 11" ceiling mounted registers (3 x 50 = 150 sq. in.) 1 return line using 14" I.D. (likely)...