Regulating indoor environment of buildings and homes through temperature, moisture, and air circulation to a comfortable level is an important and growing industry, particular in the renewable-energy sector. There are multiple methods to heat a building or home, including by furnace, boilers, heat pumps, gas-fired space heaters, solar; and to cool down a building, through air conditioning, refrigeration, free-cooling, and others. That temperature is balanced the right amount of moisture and air circulation to provide a comfortable indoor environment.