Is upgrading to a high-efficiency furnace or air conditioner worth it if my current system is still working?
Even if your old HVAC system is still working, you can save up to $550 on energy costs each year by upgrading to a more efficient system. These energy savings can translate to a short payback period on your new equipment investment. Additionally, Nicor, Peoples Gas, and ComEd offer rebate programs for upgrades to high-efficiency equipment.