I was having problems with a fairly new furnace/Air conditioner in a older home I had just purchased in july. Everything had frozen up due to a blockage from the previous owner/the company he used to clean the ducts. Andrew was able to walk me through some steps before he came, and when onsite did a very thorough job in checking the entire system. He also gave me some great ideas to help in my crawl space where the furnace is located to help with future heating bills etc (see my other review for spray foam insulation). Very knowledgeable, friendly, fast service, professional. Great customer service! I would definitely recommend him.