Transitioning residential and commercial heating and cooling systems from gas to electric is a key component in California’s plan to reduce emissions of global warming gasses. More heat pumps will be installed as electrification efforts continue to ramp up. There are large variations in the operating efficiency of heat pumps that result from our installation and commissioning practices. This class will focus on installation practices, troubleshooting and commissioning steps that effect final installed efficiency. We will look at airflow, line set plumbing, refrigerant leak prevention, location and repair, heat pump controls and control settings. Both legacy systems and mini split systems will be covered. The class will be presented in two, three-hour parts.