My experiences so far with Carbon Valley Heating & Air have been great. They were last out here for a service call, and their tech Jose cleaned out the fan and the furnace. He was here for a few hours but he arrived on time and did the work well. He showed me what he had done before he left. Before this, I used them to fix the ignition in my furnace. Carbon Valley was recommended to me by my daughter and her husband, and they've done a really good job so far. I will continue using them.