We have been using LG AC Window 1.5 ton in our office for nearly 4 yrs. it has been a good journey so far especially in hot summer days.But thr real point is that after running for a time it does not give cooling effect at all and makes noise and just gives the normal air of a fan.We have shown to many AC Sevicing Techniian, they come and do the routine maintenance check, says the gas has finished and they need to put some good filter and for some time it gives cooling air.But as the time goes by again the same problem arises.And every time the service personnel charges very good amount for servicing but of no use as the problem comes again after a week .And even after repeatedly calling the service centre, they come when they have the time .