I am a long time customer. Chris has always been the mechanic I've requested. Very capable and professional. Raymond is another qualified mechanic. My only problem is the past 2 months my unit has frozen up on weekends. Raymond replaced the expansion valve on Friday (8/5/14). Unit ran well and I left the thermostat set @ 80. Set thermo @ 78 going to bed last night. Woke up @5 and thermo read 79 with minimal cooling . Called answering service early this AM & requested Raymond to follow up today as he instructed me when he finished here Friday afternoon. 2 PM and no response from Raymond.