My landlord chose them to City Gas my very, very old heater. City Gas called to make and appointment, asking if I'd be available between 1 and 3 pm. I was. They said they'd call me about 20 minutes before they'd arrive. At 1 pm sharp, I received a phone call, and about 15 minutes later the two repairmen arrived. They were thorough, skilled, polite, and friendly. They made the repair for a reasonable price (most of the fee was for the home visit). They recommended that we replace the unit in the spring. My landlord agrees, as do I. My experience with this company was excellent, and I would recommend them to friends.