Highly recommend using this company to purchase and maintain furnace. Our technician was here at promised time, completed work quickly and efficiently. He is professional and courteous - did not complain about having to tight squeeze between houses to verify exhaust and offered to change out the filter with the new one that we just hadn't gotten around to doing yet. Comfort Masters kept us updated on the expected time of arrival without being annoying. And the business card indicates they are on call 24/365 - great for peace of mind.