Whirlpool engineer visited my home end March 2011 to check the non-working window AC and gave in writing that the rotary compressor was not functioning. The compressor is within 5 years warrantee period. The AC was taken away on 1st April and returned in my absence after 11 days with some old compressor which is groaning and making intolerable noise. Even after my family protested that the repair was ineffective and bad, they still installed it. I find attitude of the repair workshop very poor. Recommend do not buy a Whirlpool product ever.