I`ve had Christian from AMPM inspect my furnace for the past few years and recently when we moved to a house with a very old furnace we needed to use until we got a new one. He is the sole proprietor and has been in the business for a long time and knows what he`s doing. Very diligent. Not flashy or trying to sell unnecessary services. He checks everything out and does the repairs, cleans up etc to make things run smoother or be safer. He always brings a new filter and installs it. Spends time giving advice about the furnace and hot water tank. He also took a look at the gas fire places.