Air cooling is limited on ambient temperatures and typically require a larger footprint than Water Cooling, but when water restrictions are great enough to prevent the use of water cooling air cooling is one potential option. Air cooling uses an air to liquid heat exchanger to flow ambient air over tubes that contain the steam or working fluid from the turbine. A large fan is typically used to increase the flow of air over the heat exchanger. An automotive radiator is an everyday example of air cooling. In locations where footprint is not a concern and the ambient conditions are relatively low, air cooling may actually be the most economical option with the least amount of energy input to the system. When designed properly air cooled condensers require only the power input for a fan, which is typically lower than the requirements for pumping water. In relatively dry cool climates that have access to some cooling water, but not enough to operate solely on water cooling, can take advantage of Hybrid Cooling technology.