Solar ductless Air Conditioner units are a good alternative to cool your Home or Condo Where existing ductwork is not available. They are less costly to install than other units, as Ductwork is not required and energy losses due to duct leakage are non-existent. Ductless Systems are flexible because they allow for the zoning of rooms for Air Conditioning
$300 DIY solar water heater system even includes an electric backup water heater for cloudy days. It heats water to 135F (55C) on sunny days in a 80 gallon (310 liter) tank - and there are no moving parts - it relies in a thermosyphon to circulate the water.