When it’s time to move forward with an AC installation in Mount Prospect, IL, our team at Leith Heating & Cooling will be there for you. A new air conditioner could be a great investment in your home, saving you money in the long run. Most air conditioners stop operating efficiently and reliably after about 10 years. If your unit is starting to get old or isn’t working properly any more, you’ll want professional advice about getting it replaced. Our AC replacement experts can show you how to determine the right size of AC unit for your needs. We’ll install everything correctly so that your new unit run reliably for a long time.