Richair troubleshoot my Mitsubishi mini split. Very impressive! From the person who answered the phone, to Dmitri, the service manager, to wonderful Kassim, the technician - I always felt we were in good hands. Kassim was thorough, knowledgeable, able to explain to me what was wrong, answered all my questions, and yes, diagnosed the problem. I am very satisfied with the service I received, and will definitely recommend them.