Gradient's first-generation heat pump heating and cooling system is available for preorder, and ships this summer.From pv magazine USA Faced with the age-old quandary of how to cool residential buildings during the summer without central air HVAC systems, compressors that drain the grid and cause system outages, or toxic refrigerants harmful to the environment, a San Francisco startup has devised a window-mounted, mini-split air conditioner. According to the International Energy Agency (IEA), the number of AC units in buildings across the world is projected to hit 5.6 billion by 2050. Current ...Den vollständigen Artikel lesen ...