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The right selection of installation location and quality of installation work
Usually, consumers do not have any idea about the right location for installing an AC and the consumer goes with the suggestion of the installation technician. One should be aware of the installation need and should be able to discuss/question the installation technician.
The important things to keep in mind are:
Window AC shall be installed on the top of the window so that cool air, being heavy, settles downward and thus creating its own cool airflow cycle. In case, an opening is already provided in the wall for its installation, then better to prefer the same location.
The window dimensions of 1.5 T AC is 660×430 mm and depth may vary from 700 to 780 depending on the star rating i.e. in 5 stars the additional volume required for the condenser is achieved by increasing the depth.
For below 1.5T, some brands have maintained the window dimensions whereas others have reduced size. In such a case, before buying or delivery one should modify the window by inserting aluminum/wooden panel so that mounting is secured on all three sides. Otherwise, the installation technician will mount it on two sides and fill up the gap on the third side with some cardboard for insulation. This may become a source of vibration in future.
For condenser cooling, the air is sucked from three sides and if the gap is not adequate as recommended by the manufacturer, then the efficiency of the condenser will be affected. Hitachi recommends 200 mm on right and left and 100 mm on the top. If you look around the installation of AC, you will find this requirement is not observed in many of the installations.
For smooth flow of the condensate to the drainpipe, the AC installation is with an inclination to have a gap of 10mm up at the front-bottom. Be careful to ensure smooth flow of condensate to the drainpipe otherwise you will experience rusting issues after 3-5 years.
Avoid fall of direct sunlight over the condenser as it is likely to affect the condenser efficiency during peak summer and you will experience poor cooling. For this, better to have a sunshade on top of the window AC. For this, mounting on the top of the window is preferred so that sunshade can be installed. Be careful that sometimes the gap is used by pigeons to make a nest.