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When we built out a new library to house 4,000 books, we didn’t know whether we’d need to add a new air conditioning compressor. John assessed the existing capacity and decided it was sufficient to serve our increased needs. He installed a new control system to one of the existing air handlers that allowed us to add a heating/cooling zone. He also installed a new humidifier to the other handler that successfully dealt with air that was too dry during the winter months. I highly recommend John, both for installation and service.