Kelvin performed annual preventive maintenance on my Carrier Infinity air conditioning system, which was part of my service contract. This was really "instant service. I called Central Cooling to schedule, and they asked me, "Will you be home this afternoon? We can have someone do it then." Kelvin was easy-going. He explained each step of the work he was doing (including a thorough cleaning of the outdoor unit's coils), and was very neat. Kelvin is a great ambassador for Central Cooling's service.