Friday evening I received a call that every landloard dreads, reporting that there was no heat. Early Saturday morning I called One Hour Air and Heat, I'm talking 6:30a am early. The woman who answered was absolutely delightful for such an early hour. She said they would be there some time that day, and it was around 2pm when they arrived. To make a long story short, the problem was a complicated short. And of course, the heat went out again about 1 hour after the tech left. He immediatly returned and fixed the problem but did warn us that it could happen again. That was about 2 weeks ago, and he has called several times since to be sure everything was working ok. He also gave us his cell phone number which is very reassuring when you know the problem could reoccur. (Not their fault, just to be clear.) I would use them again in a heart beat. Also, I was told at the outset that they charge by the job, not by the hour. So there was not extra charge for him to return.