Hydronic heating systems have been around for decades. Remember the old radiators in grandma’s house? These days, hydronic heating systems are more sophisticated and use hot water piped through tubes that are run under floorboards, through radiators or along base boards.
The sun is the ultimate provider of green energy. Solar power is constant and renewable. It’s not going to run out anytime soon. However, you don’t need unsightly solar arrays to enjoy the benefits of solar energy. Passive solar energy is simple, has little to no moving parts and requires minimal upkeep. Passive solar-energy systems are designed to use natural principals of heat transfer instead of machines such as furnaces and air conditioners