I've been using Heartland Heating & Cooling for years to keep my furnace and A/C running efficiently. They're always professional, knowledgeable, on-schedule and considerate of my home. I love that they email me my invoice and Diagnostic - System Analysis & Summary after the service. It's very informative and helpful. The ones answering the phone at the office are also great! They're polite and very helpful. I fully recommend Heartland Heating & Cooling!