Service & Repair | B.F. Mahn is Your Local Team of Comfort System Experts

B.F. Mahn is here to take care of any service need you may have! Give us a call today to learn more!

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B.F. Mahn & Sons Inc. is Here For All Your Comfort System Service & Repair Needs



B. F. Mahn & Sons, Inc. in De Soto, MO provides commercial and residential plumbing and HVAC services. We are proud to serve customers across Jefferson County. Since 1868, our family-owned and operated business has been the name homeowners and business owners trust with all of their heating and plumbing needs, as well as bathroom remodeling services.

We offer competitive pricing, a full range of products, and exceptional customer service. From routine maintenance to urgent problems, you can trust our team of certified licensed plumbing and mechanical contractors. We work hard to provide the latest state of the art products and services and keep current through continuing education courses.


Heating Services

B.F. Mahn is your local heating system specialist!

Our team of heating repair contractors are always available to make sure your heating or hot water systems are running at peak efficiency. We service and repair all types, makes, and models of heating systems including: gas, propane, geothermal, and electric. No matter if you're looking for routine maintenance or are in a heating emergency, we have the skills and expertise to make sure your system is in working order.

  • Furnace Maintenance, Repair, Installation & Replacement
  • Boiler Maintenance, Repair, Installation & Replacement
  • Radiant System Maintenance, Repair, Installation & Replacement
  • Geothermal System Maintenance, Repair, Installation & Replacement
  • Heat Pump Maintenance, Repair, Installation & Replacement
  • Ductless System Maintenance, Repair, Installation & Replacement

Air Conditioning Services

The team at B.F. Mahn is your local cooling system service expert!

Whether you need your air conditioning system serviced, repaired, or tuned up, we have the skills and expertise to handle the job. Our team of trained contractors can service any make or model of air conditioner and will expertly diagnose and repair the issue. We can also help you prolong the life of your unit through preventative maintenance services. Additionally, if you're looking to reduce your energy bills, we can help you choose the right energy efficient air conditioning unit for your home or business.

  • Air Conditioner Maintenance, Repair, Installation & Replacement
  • Geothermal System Maintenance, Repair, Installation & Replacement
  • Heat Pump Maintenance, Repair, Installation & Replacement
  • Ductless System Maintenance, Repair, Installation & Replacement

Water Heater Services

Call B.F. Mahn when you need water heater maintenance, repair or installation.

While a water heater is a must-have appliance in your home, service or replacement doesn't really come to mind until it is too late. There is no need to panic if your water heater stops working. Our team of technicians will guide you through the process of repairing or purchasing a new water heater. We will work to diagnose the problem, and if your unit needs replacement, we will work with you to find the model to fit your needs.

  • Tankless Water Heater Maintenance, Repair, Installation & Replacement
  • Conventional Tank Water Heater Maintenance, Repair, Installation & Replacement
  • Heat Pump Water Heater Maintenance, Repair, Installation & Replacement

Plumbing Services

If you need plumbing repair, installation, or remodeling services call B.F. Mahn today! We know plumbing!

B. F. Mahn & Sons have always been on the forefront of plumbing services. We have provided communities in Jefferson County with plumbing repair, maintenance, and replacement services for 4 generations, and guarantee you will receive the best possible service at a competitive price.

  • Blocked drains
  • Blocked sewer lines
  • Blocked shower drains
  • Burst/ leaky pipes
  • Gas leaks
  • Leaking hot-water unit
  • Other plumbing issues
  • Sewer backups
  • Tap doesn’t turn off
  • Water pressure problems

Duct Cleaning Services

Is your indoor air quality suffering due to dirty air ducts? Call us today!

Dirty HVAC systems and ducting can reduce indoor air quality and the efficiency of your heating and cooling systems. B.F. Mahn & Sons Inc. Duct Cleaning service addresses dirty ducting and HVAC systems to improve indoor air quality and maximize the efficiency of your comfort systems.

  • Enjoy cleaner, healthier air in your home!
  • Reduce respiratory illness by eliminating pollutants that cause them!

Service Plans

Protecting your heating, cooling and water heating systems is important to ensure they will run for years to come.

Your home's comfort systems are an investment in comfort. B.F. Mahn & Sons wants to make sure that your investment lasts as long as possible. That is why we offer maintenance agreements to ensure that your systems are getting the care they need to run year after year! Our team of knowledgable & dedicated technicians are ready to help you! Call today.

  • Save on energy bills with high efficiency and reliable comfort systems
  • Enjoy prompt service and repair whenever you need it!