QUOTE(DecaPix @ Dec 20 2016, 09:58 AM)
outdoor unit rarely needs to be cleaned unless it's been running in very dusty area.
air cond refrigerant is a close loop.
it doesnt leak. if it does, it will lose coolness in probably 1 month(very slow leak)? not 3 years.
your indoor unit probably needs some cleaning.
have you check the blower fan?
not only the filter and the fin on the coil needs cleaning. the blower fan gets clogged up too.
i find my panasonic unit the blower fan gets clogged up way faster than the filter
Takes around 5-6 months here before it gets clogged up, Sarawak. Should be way faster in city I think.
Does leaks affect the same way as car ac system, as in spoiling the compressor through debris etc. We've been taught/scammed all this while by technicians who insist on "topping up gas", which sounds nonsense considering its a closed loop. But could recharging the gas be used to test for leaks as preventive measure? I know it works somehow like that for cars, the vacuum seal needed will indicate leaks.