Today we had our furnace serviced and cleaned. The technician Rocky was very helpful and personable. He noted we do not have carbon monoxide detectors and suggested I get one immediately and told me where and how to install it. He also gave me details on air duct cleaning. In addition, he fixed a vent that was hanging lower than the gas line which could lead to a carbon monoxide build-up. I will call upon AAA Heating and Cooling again for our furnace needs.