Hot air is less dense than cold air and as a result, when hot air rises it will 'float' on top of cold air, creating what is known as a “stack-effect” within a building. Consequently, with most forms of heating, areas end up being heated from the top down. In many buildings, this phenomenon is compounded by heating appliances being positioned at a high level in an attempt to save floor space. A temperature difference of up to 10 degrees Celsius can be typical within a 10m high indoor space.
Ceiling fans gently induce air movement which ensures that air is mixed to produce a uniform temperature. Consequently, building HVAC thermostat settings can be reduced with associated reductions in energy costs but with improved occupant comfort.
Where cooling is required, ceiling fans provide an alternative to 'energy and maintenance hungry' air-conditioning systems. The fans do not cool the air but, set at a higher speed, they use the 'wind chill' effect to provide evaporative cooling for occupants. They can also work in conjunction with air-conditioning where the movement of air improves the effectiveness of the air-conditioning meaning set-points can be reduced and equipment operation reduced.
Elimination of hot or cold spots
Improved occupant comfort
Return on Investment