I purchased this system and installed it by myself, except for some help pulling the lineset into the attic and offloading the equipment. The pre-charged lineset made it SO EASY! I installed each one in one day, and am EXTREMELY HAPPY with the Performance and Efficiency! WOW! What a nice reduction on my Power Bill. I live in Florida and the crazy weather changes have meant heat in the morning and cooling in the afternoon. These units do it effortlessly, quietly and efficiently. BUY THESE! You won't be Sorry you did!