About B.F. Mahn

Stay comfortable year round with B.F. Mahn & Sons taking care of your comfort system maintenance, repair, installation and replacement needs!

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25 Total Reviews /files//bf_mahn-logo.png636-586-2300$112 W Clement St., De Soto MO



About B. F. Mahn & Sons, Inc.



B. F. Mahn & Sons, Inc in De Soto, MO provides a range of HVAC and plumbing services across Jefferson County. We are certified licensed plumbing and mechanical contractors and are associated with the Better Business Bureau and the NFIB.

Our company is bonded and insured, so you can feel good about trusting us with your plumbing, heating, or cooling needs.

J. P. Mahn, President, along with his wife, Courtney Mahn, Operations Manager, have developed the business which has a team of qualified employees. The expansion includes now offering drain camera service as well as emergency after hours and weekend services. J. P. joined the company in 2005. Dual enrollment in high school and HVAC technical school all the while working after school/summers at B. F. Mahn & Sons, Inc., proved his ambition and drive. He started working in the field completing service, replacements, and new construction installations both in the plumbing and the HVAC divisions. After 10 years full time in the field, J. P. took on HVAC management responsibilities and has now risen to the top position as president of this historic company. Bernard F. "Biff" Mahn III and his sister Beth (Mahn) Ross will support the next generation until their full retirement: Biff as Vice President and Beth as Operations Director. In 2016, Courtney came aboard and soon after Gabe Mahn, J.P.’s brother, joined the crew.

The highly professional team employed by B. F. Mahn & Sons, Inc. will do only top-quality work to meet your plumbing and HVAC needs. From new construction to minor daily repairs, B. F. Mahn & Sons, Inc. will make it right. It is a business built on a strong foundation, impeccable reputation and first quality service skills. The family owned and operated business has been resilient through the ups and downs in the economy over the last 155 years. It has survived the Depression, economic challenges and COVID shutdowns. B. F. Mahn & Sons, Inc. is here today - and will be tomorrow.

It began as a horse and carriage blacksmith shop operated by John Kempe, with no formal name. Kempe's blacksmithing business continued into the second generation with his son, Henry Kempe. Henry's daughter, Mildred, married Bernard F. "Dutch" Mahn, who expanded his in-laws' operation in the 1920s. Dutch started a tin smithing shop on the upper floor, where he did gutters, roofs and stovepipes. For a little over a decade, both businesses thrived, blacksmith on street level and tinsmith on upper level. By the mid 1930's, even the largely rural, horse-and-buggy town of DeSoto, was going mobile as automotives became the transportation of choice, and the need for blacksmithing services faded. The family restructured the business plan to advance with the changing times.



B.F. Mahn has been providing the De Soto, MO area with expert plumbing and heating services since 1868!

This strong family business will continue to operate out of the same two-story brick building where their great-great-great-grandfather was recorded as a blacksmith in 1868. B. F. Mahn & Sons, Inc. - Plumbing, Heating, Ventilation and Air Conditioning - 112 W. Clement Street, is the oldest business (family or otherwise) still operating in Jefferson County...Now it’s time to pass the torch to the new generation. J. P. has stepped into his family’s shoes, running the business and continues as a respected leader in the community.

Time changes everything, but this family has proven:

B. F. Mahn & Sons, Inc. is here today – and will be tomorrow.

B.F. Mahn has been providing plumbing and heating services for our community since 1868!

As an innovative entrepreneur, Dutch Mahn led the area in a new direction with the advancement of indoor plumbing and heating technologies. Phillip “Phil” William and Bernard F. “Bernie” Mahn, Jr. were next in line to continue the legacy in the 1950’s. Bernie ran and expanded the thriving business while Phil continued with the tinsmith skills and turned the wrenches. Biff Mahn’s own introduction to the business came at the tender age of 10. He began holding flashlights for the men and sometimes getting into crawl spaces, in between floor joists or anywhere else the bigger guys couldn’t fit. He didn’t collect a dime but collected more knowledge than available at any university. He began earning a paycheck during high school, working summers as a plumber’s apprentice. He’s been there ever since. Beth (Mahn) Ross started working summers when she was 15, but unlike her brother, she didn’t come back into the family business as an equal collaborator until 1993 when Bernie was forced into early retirement due to failing health.

Our Current Staff is:

B. F. "Biff" Mahn, III
Beth (Mahn) Ross
Jonathan "J.P." Mahn
Brian Scott
Pat Youngman
Danny Lewis
Gabe Mahn
James Degenhardt
Pat Raymond
Allen Gore
Wendy Hammond

Trusted Plumbing & Heating Services in Jefferson County Since 1868

For over 145 years, B.F. Mahn & Sons, Inc. has provided plumbing and HVAC services in De Soto, MO and surrounding areas. We are proud to be family-owned and operated, and work hard to treat every client like family.

For more information about our plumbing, heating, cooling, or bathroom remodeling services, please give us a call at (636) 586-2300 or fill out a contact form