We perform ACCA Manual D&J Heat loss Calculations. Manual D&J Heat loss Calculations are becoming more and more prevalent across the country. Many building inspectors and municipalities are now requiring these energy calculations to be performed on a building before a building permit will be granted on a new or remodeled building. The manual J calculation evaluates the energy consumption of the building in regards to heating and cooling that space. I take into consideration variables like, elevation, local seasonal temperature data, relative humidity, orientation, exposures, building quality and air infiltration, insulation R-value, building materials, window quality and its solar heat gain co-efficient, glazing, appliances and lighting. The result is an individualized and detailed report that tells us exactly how much heating and cooling is required in the building to maintain the design temperature. With this information, you can be assured that the system installed is sized correctly for the your home. Based on the Manual J, duct work is designed to match the static pressure, airflow and heating & cooling requirements of the building. This is the manual D portion of the report.