Dual Fuel Systems Make Heating Even More Efficient. Many of the fuel systems we provide at Street Heating & Sheet Metal Inc in Rapid City boost your home’s efficiency more when they work together with another Lennox® system than they by themselves. 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 operate efficiently on their own, but when you combine 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 based on your chosen 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 demand for maximum MPG. You’ll be able to hone your energy use, and you could reduce your heating costs. 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 605-340-0558. Street Heating & Sheet Metal Inc is located in Rapid City, so you can easily schedule an appointment to have us do an in-home consultation and show you how a dual fuel system could work for your home.