Save up to 30% on heating and air conditioning as these fans circulate warm air down in the winter and by reversing rotation, provide a cooling breeze in the summer. Can pay for itself within one year. These industrial fans increase employee comfort and can improve productivity. Due to the high speed of industrial “heat fans”, they should be used in commercial settings such as a warehouse, shop or factoy. They should be installed at least 10 feet from the ground and are not safe for residential applications.