We have a 1.5 ton LG "intelloair" window air conditioner in the study.
It's been so hot so early this summer that it can't cool effectively at
midday, when I want it the most.
The AC displays a number that represents the current indoor temperature
(I don't know how accurate it is) and the desired temperature. When the
former is higher than the latter, the compressor comes on, and cold air
is blown into the room. When one temperature is sufficiently close to
the other, the compressor is switched off to maintain equilibrium.
When the estimated indoor temperature is above 30, however, I've noticed
that the compressor is switched off long before the desired temperature
is reached, and comes on only much later. The result is that
the indoor temperature stays consistently high (aside: if it's higher
than 39, the display just shows "Hi").
The LG technicians said there was no cure. When it's so hot outside, the
compressor overheats and shuts down very quickly if it has to work hard
(i.e., when the difference between the current and desired temperatures
is high), and is switched on again only after it has cooled down enough,
by which time the temperature difference is so high that it has to work
very hard, and…
It makes a strange sort of sense, but that is cold comfort when the
computers and AC all blow hot air at me. Blocking the drainage outlet
and pouring cold water into the chassis (which the technicians did to
help the compressor cool down more quickly) is only a partial solution.
Setting the desired temperature higher only postpones the inevitable on
a hot day: it overheats on the second cycle instead of the first.
Since none of the other ACs I've used in similar temperatures (Carrier,
Electrolux, unbranded) has had problems to this extent, I am forced to
conclude that the LG intelloair is a lousy air conditioner.
Now I understand why there is a huge hoarding near Pragati Maidan
advertising an AC that cools
even at 54°C.