Hi all, just wanted to chime in about HVAC in Illinois—especially around the Lake County area. With the extreme weather changes we get around here, it’s key to have a solid heating and cooling system. I just had work done by Optimized Air HVAC Gurnee Air HVAC in the Round Lake area, and they were awesome—timely help, affordable costs, and walked me through the whole process. If you're experiencing furnace problems or need an AC checkup before the next heat wave, I’d highly suggest finding a local company that specializes in Midwest HVAC. Stay warm!