Cal Air Cooling and Heating is a very good company! They are honest and tell you the way it is. Years ago, they installed our old HVAC system. Just recently we upgraded to a top-of-the-line, energy-efficient, three zoned system. Cal Air did the job for us. They are knowledgeable and always prompt. They never disappoint! The guys from Cal Air explained everything about the new system and showed us how all the parts work and what to watch out for. The new, high-end unit with a three-zone system is exactly what we wanted, based on the advice of an engineer friend. Not everyone wants to spend the money for this level of unit, but personally, I can't wait to see how low my energy bills will be next summer!