There's also some cool combo rooftop solar panels/water heaters. [1] By cooling the panels themselves they increase their efficiency by up to 15% (so an increas

There's also some cool combo rooftop solar panels/water heaters. [1] By cooling the panels themselves they increase their efficiency by up to 15% (so an increase from ~20% to ~23% total efficiency) - while also heating water for the home. [1] https://dualsun.com/en/product/hybrid-panel-spring/ https://dualsun.com/en/product/hybrid-panel-spring/