HELPFUL TIP Did you know furnaces can get asthma? Carbon deposits can wreak havoc on efficiency, so have your furnace burners cleaned every 1-2 years. > More Tips   Roger and his wife, Jan, learned firsthand how much we rely on heat in our frigid climate. At Genz-Ryan, we understand the inconvenience and always work to restore heat as quickly as possible. We can satisfy everyone with our complete heating systems. We install and service the latest high efficiency furnaces by Lennox and Carrier. Our technicians are always available in case of an emergency and our service plans allow you to relax knowing your heating system is being maintained properly.