If the condensing unit is in a busy spot such as near a walkway or other location where the fins are constantly deformed, a metal guard should be installed to prevent this damage. These are available as factory accessories, and are often marketed as hail guards. The coils can also become fouled and dirty. This has an adverse affect on the efficiency of the unit and so the coils should be kept clean. This includes the fan blade, as a dash of mud solidified on the blade imbalances the fan and cause the bearings to wear and the motor to work harder to overcome the extra friction.
Time clocks are a simple and inexpensive way to reduce space conditioning costs.
The equipment can be turned off at close of business every day so that cleaning crews or late working tenants do not keep the equipment running late. Even if only a single air handler in a large building is in operation extra hours the main chiller or boiler must stay on line, and both systems operate very inefficiently at low loading conditions. So the energy that is used is at a premium. Packaged systems can be controlled by a timer also. A school, for example, may have individual units for the classrooms, kitchen and gymnasium.