I have been using TCL1.5T split AC since 9 years and I never had any problems with the AC at all. In fact, 99% people do not know how to use the AC, as it involves lots of technical issues like Heat Load Calculation, Size of the room, heat generating equipments, type of partitions, type of wall, type of paint, type of windows, type of furniture, number of inmates, type of installation done etc., which no person, except a qualified mechanical engineer or AC engineer can understand.