Few days back I opened cover of an Air-conditioner in the institute and saw the filter. It is very easy, anybody can open a removable cover in the front of window air conditioners and in split air conditioners, it is usually hinged that can be pulled up. The filer was so dirty that when I kept it facing the sun, I could not see even a single ray of sunlight. Just imagine, how can the return air pass through it in such condition. The person was complaining that his AC has stopped cooling the room. Now I think reason is quite clear.
Needless to day that when he cleaned up the filter and started the AC, it cooled the room pretty well. I guess, dirty filters alone result into something about 10-15% energy wastage in ACs.
Then we checked filters of several other ACs and found the most of the ACs have dirty filters.
This not only deteriorates performance of AC, but also provides cool place for growth of infection and also acts as accumulator for respirable class dirt particles.
We should clean up the filters once every month to avoid such situation.
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