Despite every effort to make them efficient, heating and cooling systems can only be truly efficient if they are able to effect an even temperature distribution in the whole room or house. However, this is quite tricky, as homes often lack the infrastructure to distribute hot or cold air evenly.
The Register Vent Booster Fan aims to ‘pull’ out heated or cooled air from air vents and push the air into the room. This therefore boosts the efficiency and energy saving potential of any heating or cooling system. The booster fan fits over existing ventilation grills in the home, and is activated by a temperature-sensitive sensor.
Generally speaking, improving the air flow in a home will avoid cold or hot spots. This is where pockets of air are unable to circulate, leading to uneven temperature in a room or home. By simply using air circulation gadgets, you can considerably reduce your energy bills.
Source: Coolest-Gadgets