I have used Wolverine Heating & Cooling a few times over the past couple of months. They came out at first to check out the heating unit since it wasn't working, the technician got it working again just fine. This week it stopped working again so the technician came back yesterday. I appreciated that he didn't charge me for this visit since he had to come back so soon. He got it running again. The tech was professional and polite during both visits. I would use them again.