Contractor is to install central heating and cooling system. All work will be executed in accordance with the most current IRC, IMC, IPC and NEC Codes and the EPA regulations pertaining and the City of Dallas Codes. Installation will also comply with the warranty requirements of the manufacturer. All fees in connection with the work including but not limited to permit fees, utility charges and related labor expenses to these items, will be paid by the mechanical Contractor. . Each room designed to be living space will have a minimum of one duct and vent except where the size of the room would require more than one. Ducting requirements will be calculated using industry standard duct calculations based on the heat and cooling load required by each room. The exception to this would be in bathrooms where there is electric heat and an electric ventilation fan. The return air grill and thermostat will be placed within the structure in a manner that will allow good air circulation and high performance of the heating and cooling cycle. Contractor will insure system balance by the practice of undercutting doors, installing door grills, or installing jumper ducts.