Let your local HVAC contractor in Lansing, IL check it out When your heat or A/C unit goes out, your property can become uncomfortable very quickly. You need a well-qualified technician to check your system out. Certified Heating, LLC is the right crew for the job. We provide complete heating and cooling services in Lansing, IL. We'll handle our A/C or furnace repair quickly and correctly. Call 708-283-4695 now to make an appointment with your HVAC contractor.