Heat Load Calculations This is the 5th part of the full HVAC course. In this part we will see about Heat Load Calculations. Heat Load Calculation HVAC (Heating Ventilation Air Conditioning) Thumb Rule The HVAC system has two functions: to heat or cool your home, and to provide ventilation or fresh air to your environment. It works by using either hot water or electricity to move the air through your house. When selecting a home heating or cooling system, you should always consider how much energy the HVAC unit uses. Energy use is measured in British Thermal Units per hour (Btu/h), which is just a measure of energy used. To calculate Btus/h use this simple equation: Energy Use (Cooling Capacity) x (Cooling Efficiency) + (Heating Capacity) x (Heating Efficiency). Example 1: If your home has a cooling capacity of 60 tons and your cooling efficiency is 90%, then your energy use would be 0.6 tons x.9 5.4 tons/hour. This means that your HVAC system runs at 5.4 tons/h. Example 2: If your home...