Hello folks, just wanted to chime in about HVAC around Illinois—mainly near the Northern Illinois area. With the extreme weather patterns we get locally, it’s key to have a reliable heating and cooling setup. I just had work done by a local Hvac antioch il (http://vintagemachinery.org) company called Optimized Air Heating and Cooling in Round Lake, and they were awesome—timely help, affordable costs, and were very transparent about what needed to be done. If you're facing furnace problems or need an AC maintenance before the warm months, I’d encourage finding a local company that knows our climate. Keep cool!