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About Us

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Reliable HVAC Professionals

Whether you need a maintenance check or an emergency repair on a furnace or air conditioner, we are available to handle all of your heating, cooling, and refrigeration needs.  We strive to exceed your expectations by ensuring that each of our customers receives individualized service. 

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Individualized HVAC Options

We will work with you to find HVAC solutions that fit your heating and cooling needs. We will provide you with a full consultation to explain all of your available options so that you can choose the system that’s right for your home or business.

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Customer Satisfaction Guaranteed

We serve both residential and commercial customers and offer a variety of money-saving solutions. We combine our use of the highest quality parts and equipment, and our dedication to delivering exceptional service to make your experience the best possible.

Who We are

since 1971

 Mertens Service is a Heating, Air Conditioning, and Commercial Refrigeration business based in St Louis, Missouri.  Having been in operation for almost 50 years we take pride in providing service and comfort to both residential and commercial properties.  Families  in the Greater St Louis Area have come to trust Mertens Service with their homes and businesses delivering piece of mind and quality service.