My father has used Rod Johnson Air for decades. When we bought the house from my parents we continued using them. We had them install a new unit and do a split level system to upgrade the HVAC system in our 1978 2-Story house in Stockton. We will continue to use them for our bi-annual check-ups and when we need a new system in the future. My parents still use Rod Johnson Air in their new home in another county in CA. They are reasonably priced and have great service. They set up appointments in a timely manner. They have been out to help me with the thermostat when I couldn't figure it out at no charge. We are completely satisfied with Rod Johnson Air.