We’ve Got Energy Efficient Furnaces to Keep Your Family Warm All Winter A furnace shouldn’t leave you hanging in the middle of our Crystal Lake winters. In fact, at Jett's Heating & Air Inc., we believe you deserve a furnace that is energy efficient, works quietly and saves you money. Our variety of ENERGY STAR® qualified Lennox® gas and oil furnaces, which have met or exceeded EPA guidelines for energy efficiency, will do just that. The furnaces we offer feature Lennox ingenuities like variable speed motors and PreciseComfort™ technology and work smarter, not harder, to generate consistent heat with more energy efficiency. Fewer temperature swings. Better comfort. More saving. Sounds pretty great to us. All of our energy efficient furnaces are a great choice for your Crystal Lake area home. They can enhance humidity control and air filtration, giving you improved indoor air quality. When you select a Lennox furnace from Jett's Heating & Air Inc., you can stay cozy throughout the season. Peruse our energy efficient gas and oil furnaces to learn more. Gas Furnaces Oil Furnaces We’re knowledgeable and willing to help with any of your heating needs, whether it’s a furnace replacement or a furnace repair. Just give Jett's Heating & Air Inc. a call at 815-459-4700 or make an appointment online to get started.