In this type, the rated power is determined in such a way that the outdoor unit is not in any way protected by shadows or shields; That is, the outer plate casing essentially casts a shadow on the condenser, i.e. the heat sink. If the system is completely enclosed, ie well-installed and well-fitted, it will not leak for many decades. This, of course, depends on the quality of the copper tube used, the quality of the flange on the tubes. Of course, it increases the lifetime of the climate if it is in a place where it is more protected. Generally speaking, if the outdoor unit is in a sheltered place, it will dust sooner. With a hand-held sprayer, it is advisable to wash more frequently with clean water from the lamellae of the outdoor unit. This keeps the factory performance. If you are in shade and in a sheltered place, less energy is invested in the operation, but of course this is very small overall. Regular cleaning is more important. I noticed that the pipes running outdoors do not have any protection. In Europe, it is standard that these pipes should be routed in an outdoor plastic air channel, because their outdoor insulation will eventually dissipate from the sun's UV radiation. If this happens, it is advisable to put in a new tube. Furthermore, the pipe is more aesthetic when running in a plastic channel. Be careful to drop the pipeline at all points towards the outdoor unit. Many people forget, but the refrigerants in them are no longer as perfectly blended as the banned ozone damaging R22. (Mixing of oil and refrigerant). For this reason, not every point of the system is lubricated (low oil consumption) or even an oil plug may develop. Therefore, they are instructed by thermal engineering engineers to make the piping slightly sloping (ie not a rough slope). Of course there is also a horizontal section if there is no other solution. However, very little climb in the tube is forbidden, especially for inverters with low power. If you pay attention to this, you will be in good friendship with this device for long years. Durable, high quality device. The indoor unit, however, often needs to be cleaned with a fungicidal composition, such as alcohol-containing hospital and solarium disinfectants. Use of chlorine-containing agents is strictly prohibited! Especially, the blower of the indoor unit needs to be cleaned with this alcoholic substance, because in this type of black fungus is highly prone to settling.Greetings from Hungary.