About Jett’s Heating & Air Inc. If you’re looking for heating and cooling services or expertise in the cities and towns within 25 miles of Crystal Lake, look no further than Jett’s Heating & Air Inc. We’ve been around since 2004, and our staff is knowledgeable and fully trained on a full range of HVAC products, maintenance, technology – you name it. We thrive to give comfort while providing the best quality service, which is why we offer a four-hour response time and a live service rep to answer your calls 24/7. Aside from offering excellent service, we also offer a wide range of high technology and innovative Lennox® HVAC products. If you’ve heard the Lennox name before, you probably know about its dedication to creating quality equipment through continuous innovation. When you work with Jett’s Heating & Air Inc., you’ll find products that may be more efficient and could even help reduce your utility costs. We’re proud to do business in the McHenry area, so we sponsor a number of local sports teams and organizations. We have also helped raise nearly $500,000 for local families in McHenry County through local charities. Your comfort is our #1 care. Whether you need heating and cooling services such as repair and maintenance, or you need to replace your HVAC system, we’re ready to help. Call Jett’s Heating & Air Inc. in McHenry at 815-459-4700 to learn more, or schedule an appointment online to start working with us.