Your Source For Macomb & Oakland County HVAC. Request an Appointment. We are one of the top heating cooling contractors in Macomb & Oakland County, MI. Furnace & ac Repair, new installation, replacement. Major brands serviced. If you need a heating and cooling service in Macomb County or the surrounding areas, call the experts today at Oasis Heating & Cooling. 48036, 48035, 48042, 48044,