Alexander did an excellent job tonight! Our air conditioning stopped working in the late afternoon and we noticed slightly after 5:00 PM. We called Mason air conditioning and they promised to send someone out this evening. Alexander arrived earlier than expected. He diagnosed the situation. He solved the main problem. He identified another potential problem. And because of his good work, our air conditioning was back up and running. He also identified additional work that can be done to prevent future issues and promise to come take care of that. We could not be more pleased.