We bought our AC in April, 2012 from Lucknow. During whole summer time it did not work well and we contacted many times to the nearest service centre and then visited some very unprofessional to take care of our problem but in vain. But since the raining started and the temperature came down it started working well which means it is useful only when the temperature is not very high.
On the other hand, our other window AC of other company was working well even in month of June-July. Not a good investment.