When I moved into my Granddad's one-hundred-year-old farmhouse, it didn't have any central heat or air-conditioning. The whole house was heated with a wood stove and they used fans for cooling. So one of the first things I did was hire Rocky Top Air to install a three and a half ton unit in the attic. The temperature up there was over one hundred degrees on the day the installers came, but they never complained. They also installed ductwork throughout the house. The guys from Rocky Top Air did a great job. Since then, the company has been prompt in scheduling routine maintenance and they always send qualified guys. I recommend them highly!