Get affordable and friendly heating, cooling, and more from the most trusted, family-owned and operated business in the Michigan City region, Doler Services Heating and Cooling. You can rest easy knowing that there is always an answer for your HVAC needs. Doler Services Heating and Cooling offers 24-hour emergency service. We're a NATE certified contractor and a Lennox premier dealer. Get the job done right the first time when you call us about your heater, A/C, water heater, and more. End the search for Michigan City's premier HVAC specialist. Doler Services Heating and Cooling services all major makes and models of heaters, furnaces, A/C systems, and water heaters. Call the heating and cooling team that gets the job done right the first time. Since 1953, we've been the family-owned go-to for locals throughout the region.