Golden Seal Service Experts Heating & Air Conditioning in Saint Charles Introducing Golden Seal Service Experts Heating & Air Conditioning in Saint Charles. We’ve been servicing you and our Saint Charles community since 1985, and we’ve created a full roster of NATE-certified service technicians who know how to service, repair and install nearly every brand of furnaces, air conditioners, air handlers, inside air quality and related equipment. In fact, we have 13 technicians and 20 service trucks in the Saint Charles area alone. And that means that you have our expert technicians just minutes away, whether you’re in need of a furnace repair in the middle of a cold winter night or an AC repair on a sweltering summer day. Just think of Golden Seal Service Experts as your all-around HVAC company. We service all makes and models of HVAC systems, and we sell them, too. It’s true, we do it all – residential service and maintenance, commercial HVAC services, indoor air quality. Additionally, we offer lots of home energy solutions so you can start saving big on your heating and cooling expenses. Even better, all of our work is backed by our 100% Service Guarantee for a full year. That’s what we like to call “Expert Service, Guaranteed.” Call Golden Seal Service Experts in Saint Charles at 630-246-2698 now to schedule an HVAC repair service, routine maintenance or to request a free estimate.