Do you need some help with a new furnace installation in West Dundee, IL? Leith Heating & Cooling delivers expedited furnace replacement service throughout the area. If you’ve noticed a dip in your furnace’s performance, it might be time to get a new one. Or, maybe you’ve heard some strange sounds coming from your old furnace. Once they reach a certain age, furnaces just don’t work the same anymore. We’ve seen plenty of broken or faulty furnaces in our time, and we know how to replace them.