It is necessary to mount the compressor (external part) not on the balcony, but outside the window, so that it can easily reach it (in order to prevent breakdowns). Otherwise you will have to use the services of an industrial climber, and this is expensive. When installing a split system yourself, know that its outer part should be attached at a distance of ten centimeters from the wall-no less, t. To. If you fix it back to the wall, then in the summer the compressor will certainly overheat and fail. When the installation of this climatic equipment is carried out by professionals — make sure that this requirement (10 cm from the wall) is fulfilled.