Frequently Asked Questions

We proudly serve Jefferson County and surrounding areas.

Yes, B. F. Mahn & Sons, Inc. is fully licensed, bonded, and insured for your protection and peace of mind.

Yes, we offer after-hours and weekend emergency services. If you have an urgent issue, call us and our on-call technician will respond.

You can call our office to request an appointment.

You can call our office to request an appointment.

Yes! We offer financing options (with approved credit), including promotional plans like 0% interest for qualified customers.

We handle everything—from small leaks to full remodels and new construction plumbing.

Common causes include buildup in pipes, leaks, failing pressure regulators, or municipal supply issues. We can diagnose and fix the problem quickly.

Yes—we provide drain camera services to accurately diagnose sewer line issues.

We recommend twice per year—once in the spring for cooling and once in the fall for heating.

Most systems last 10–15 years depending on maintenance and usage.

• Frequent repairs
• Rising energy bills
• Uneven temperatures
• System is 10–15+ years old

Yes! Our maintenance plan includes two visits per year, discounts on repairs, and priority scheduling.

Yes—we handle full rough-in and finish work for both plumbing and HVAC systems.

Yes—we stand behind our workmanship. Warranty details vary depending on the service or installation.

We’ve been serving Jefferson County since 1868. As a sixth-generation family business, we take pride in delivering reliable, honest service you can trust.

B. F. Mahn & Sons, Inc. provides residential plumbing services in De Soto, MO and Jefferson County, including leak detection and repair, pipe replacement, water heater installation and repair, drain cleaning, and general plumbing maintenance for homeowners throughout Jefferson County.

We've been serving Jefferson County since 1868. As a sixth-generation family business, we take pride in delivering reliable, honest service you can trust.

We provide residential HVAC services in De Soto, MO and Jeffersson County, including air conditioning and furnace installation, repair, and maintenance. Our team helps homeowners maintain comfortable indoor temperatures year-round with energy-efficient heating and cooling solutions.

Yes, B. F. Mahn & Sons, Inc. offers commercial HVAC services throughout Jefferson County, MO. We specialize in installation, repair, and maintenance of heating and cooling systems for commercial buildings to ensure optimal performance and efficiency.

Absolutely. We provide both plumbing and HVAC services for residential and commercial customers in De Soto, MO and the surrounding Jefferson County area, making us a one-stop solution for all your heating, cooling, and plumbing needs.

Choosing a local company like B. F. Mahn & Sons, Inc. ensures fast response times, personalized service, and deep knowledge of the plumbing and HVAC needs specific to homes and businesses in De Soto, MO and Jefferson County.