There are three major issues when a contractor installs a new HVACR system in your home. The major issues are design, installation and commissioning. A failure to do any of these tasks correctly will have an adverse effect on one or more aspect of the overall performance of your system.Design work consists of Selecting the type of system and equipment plus operating and safety controls that are compatible with the architecture of your home you may need zoning in your home, fuel availability, fuel costs, the space available for equipment and duct runs, appearance issues and project cost. You should also compare the marginal cost of an increased increment of efficiency with the potential savings and the return on this investment. At some point, the payback on more efficiency becomes unattractive.Having a Manual J load calculation completed for each room and for the load on each if more than one central unit.

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