Best Commercial Water Treatment in New York NY

I PURCHASED A MITSUBISHI SLIM DUCTLESS SYSTEM 3 YEARS AGO,WORK GREAT FOR 2 YEARS THIS YEAR THE UNIT DOESN'T OPERATE ,FOR THE LAST 2 AND A HALF MONTHS I`M TRYING TO GET A MITSUBISHI AUTHORIZE TECHNICIAN TO FIX THE A/C BUT NO LUCK.I RECOMMEND NOT TO PURCHASE MITSUBISHI A/C BECAUSE THE SERVICE SUCKS.