Dual Fuel Systems Make Heating Even More Efficient. Several of the fuel systems we carry at C-N-O Comfort Zone in Saint Peters boost your home’s efficiency more when they work in tandem with another Lennox® system than they do alone. The same is true for for our dual fuel capacity gas furnaces and heat pumps, which can pair up to offer higher efficiency and greater comfort for your family. Both systems are great alone, but when you marry the gas furnace and the heat pump, you’re taking advantage of both gas and electric fuel. The two systems will switch between electric or gas heat in accordance with your preferred indoor air temperature and the operating efficiency of each unit. This works the same way as a hybrid car, alternating between electric power at low speed and gas power with increased demand for maximum MPG. You’ll be able to hone your energy use, and you could decrease your heating budget. Typically the electric heat is used until the outdoor temperatures dip to about 32 degrees Fahrenheit before switching to gas. Not only will you feel comfortable, but you can feel good about the efficiency of your dual fuel systems, too. Find more about the details of each of our gas furnaces and heat pumps here on our website, or give us a call at 636-578-1777. C-N-O Comfort Zone is located in Saint Peters, so you can easily make an appointment to have us do an in-home consultation and show you how a dual fuel system could work for your home.