I had a very positive experience with R and R Electric in Simi Valley, and I would like to recommend them to repair and/or install any type of air conditioning or heating unit. R and R Electric performed a very difficult installation of an air conditioning unit to the top of my second story condominium roof. This installation was performed by William Diosy, a technician from R and R Electric. He could have performed this task using a very costly crane. But he used other means which were much faster and safe. The price was right too. The price was about a thousand dollars less then other contractor bids. This was all done in about six hours. William should be commended on his skill, knowledge and personal attention he put into my air conditioning problems. Thank you R and R Electric!