In my career I have worked on giant air conditioning chillers the size of a school bus in Manhattan buildings, installed oil-fired boilers for the power companies and in residential homes, installed hundreds of natural gas hot air furnaces and laid miles of ductwork. I have installed over 7000 central ac units. I have built refrigeration walk-in boxes and refrigeration systems. I have installed and repaired ice machines of all kinds: cube ice / flaked ice / tube ice / flat plate ice. I have manufactured over 10,000 reverse engineered a/c and heat pumps. I have installed both open loop and closed loop geo-thermal heat pump installations. I also have created a few inventions!