Highly recommend this company. "Phillip" arrived at the agreed appointment time and spent over an hour trying to quiet my noisy unit. The cause was not mechanical but due to the rush of air through inadequate overhead and duct space. It's an old unit in an old apartment. He advised a replacement probably would not sufficiently decrease the noise due to construction constraints in my building. He spent his time and effort and did not charge me a service call. He was totally honest and regretted not being able to help and in his opinion a new unit would be too expensive to warrant the results. I feel very comfortable in recommending his services.