Service Plans | B.F. Mahn is Here to Keep You Comfortable

Stay comfortable no matter the weather or season with preventative maintenance services from B.F. Mahn! Call us today to join our service plan.

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B.F. Mahn & Sons Inc. is Ready to Help You Stay Comfortable All Year



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.


Spring Tune-up


  • Check & clean condenser coils
  • Check & clean evaporator coil
  • Check & clean drain pan
  • Check & lubricate condenser fan motor
  • Check all electrical controls – caps, contacts, etc.
  • Check condensate system to prevent leaks
  • Check & monitor refrigerant pressures & check for freon leaks
  • Test compressor’s starting and running amperage
  • Record temperature drops & electrical data for system evaluation
  • Check condenser fan blades for balance & damage

B.F. Mahn is your local team of air conditioning and heating specialists! Call us today to schedule your preventative maintenance today!

Fall Tune-up


  • Pull blower wheel, inspect & clean
  • Check & lubricate blower motor
  • Clean & inspect cabinet for contamination & mold growth
  • Check all limits & safety devices
  • Check circuit board operation
  • Check all wiring
  • Record temperature rise & electrical data for system evaluation
  • Check thermostat calibration & battery life
  • Check air filters
  • System evaluation

  • Heat Pump or Electric
  • Check operation of sequencers &/or heat relays
  • Check all elements
  • Check all electrical resistors

  • LP or Natural Gas Furnace
  • Check heat exchanger
  • Check burners, remove & clean if necessary
  • Check flue
  • Check for gas leaks