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***We do not service window units!*** **We do not provide service for wall units. **Please do not call us in regards to wall or window air conditioning units. With an A+ rating from the Better Business Bureau, Premium Mechanical provides exceptional heating and air conditioning installation, repair and replacement services to residential and commercial customers in the Chicago area. From the most complex installation to routine service and maintenance, Premium Mechanical has the tools, the people and the products to provide a system that fits your lifestyle and budget. ** We do not repair or sell propane heaters since they are illegal in Chicago.