The mechanical contracting industry is responsible for installing the heating and air conditioning, piping and plumbing systems in constructed projects. Without these elements, they would be without interior climate control, water supply and waste removal systems essential to modern society. The mechanical contracting industry functions through a group of individual, independent contracting firms. These firms competitively make offers to owners, builders or government authorities to install mechanical systems for a given project at a specified price and within a specified time. Successful bidding requires a team of highly skilled and productive individuals. The Mechanical Contractors Association of Georgia ( MCAG ) is one of the oldest organizations in Georgia representing the heating, ventilating, air conditioning, refrigeration and plumbing industry and it is certainly the most respected. Its members are among the best firms in the industry. They deliver cost-effective, timely results and stay abreast of leading-edge industry practices.