what is Passive House Institute what does passitive in passive house institute mean

The Passive House Institute is an organization that promotes and develops the Passive House standard for energy-efficient buildings. The term "passive" in "Passive House Institute" refers to the concept of passive solar design, which utilizes natural sources of energy, such as sunlight and heat, to reduce energy consumption and increase comfort in buildings. The Passive House standard focuses on reducing energy demand through high levels of insulation, airtightness, and ventilation, resulting in buildings that require very little energy for heating and cooling.