For over a century, H. A. Thompson & Sons has been the name Bismarck residents and businesses trust for exceptional plumbing, heating, air conditioning, and mechanical contracting. We are not just a s...
For over a century, H. A. Thompson & Sons has been the name Bismarck residents and businesses trust for exceptional plumbing, heating, air conditioning, and mechanical contracting. We are not just a service provider; we are a family-owned legacy built on unwavering service and a commitment to doing the job right the first time.Our team understands that your home or business is your largest investment. That is why we bring legendary service to every call, using the latest technology, from Mitsubishi mini-splits to advanced energy conservation methods. As a proud LINC Service Contractor, we provide proactive Environmental Maintenance Agreements that keep over 1,000 commercial buildings in the...
Professional solutions tailored to your specific needs — delivered with expertise and care.
01
Forced Air Heating and Cooling
Maintaining consistent indoor comfort in Bismarck requires a reliable forced air system. Whether you need a high-efficiency furnace, a central air conditioner, or complete system replacement, our NATE-certified technicians deliver precise installation and repair. We serve both residential and commercial properties, ensuring your forced air equipment operates at peak performance.Our process begins with a detailed load calculation and free estimate. We explain equipment options, SEER ratings, and...
Maintaining consistent indoor comfort in Bismarck requires a reliable forced air system. Whether you need a high-efficiency furnace, a central air conditioner, or complete system replacement, our NATE-certified technicians deliver precise installation and repair. We serve both residential and commercial properties, ensuring your forced air equipment operates at peak performance.
Our process begins with a detailed load calculation and free estimate. We explain equipment options, SEER ratings, and AFUE efficiency so you can make an informed decision. From filter changes to emergency breakdowns, we respond promptly. As a family-owned business, we prioritize clean workspaces, transparent pricing, and long-term durability.
Why trust us with your forced air system? Because we have over 100 years of local experience, we understand how Bismarck winters demand reliability. We also offer financing and maintenance plans to prevent costly failures. Let us keep your home or office comfortable in every season.
02
Mitsubishi Mini-Split Systems
Ductless heating and cooling solutions are ideal for additions, garages, or buildings without existing ductwork. As an authorized Mitsubishi Electric contractor, H. A. Thompson & Sons installs hyper-heat mini-split systems that perform efficiently even in sub-zero Bismarck winters. These systems provide zoned comfort, reduce energy bills, and improve indoor air quality.Our team assesses your space, recommends the correct BTU capacity, and handles the full installation—from mounting indoor units...
Ductless heating and cooling solutions are ideal for additions, garages, or buildings without existing ductwork. As an authorized Mitsubishi Electric contractor, H. A. Thompson & Sons installs hyper-heat mini-split systems that perform efficiently even in sub-zero Bismarck winters. These systems provide zoned comfort, reduce energy bills, and improve indoor air quality.
Our team assesses your space, recommends the correct BTU capacity, and handles the full installation—from mounting indoor units to connecting the outdoor condenser. We also service existing mini-splits, cleaning filters, checking refrigerant levels, and troubleshooting error codes. With quiet operation and individual room controls, you save money while staying comfortable.
We stand behind every mini-split project with a workmanship guarantee. Our technicians receive factory training, ensuring your system meets Mitsubishi’s high standards. For eco-friendly heating and cooling in Bismarck, trust our family to deliver professional results.
03
Residential Plumbing
From leaking faucets to repiping entire homes, H. A. Thompson & Sons provides full-service residential plumbing in Bismarck. We handle water heater replacements, drain cleaning, toilet installations, and slab leak detection. Our plumbers are licensed, background-checked, and respectful of your property—wearing shoe covers and using drop cloths on every job.Emergency plumbing issues never happen at a convenient time. That is why we offer same-day service for burst pipes, sewer backups, and water...
From leaking faucets to repiping entire homes, H. A. Thompson & Sons provides full-service residential plumbing in Bismarck. We handle water heater replacements, drain cleaning, toilet installations, and slab leak detection. Our plumbers are licensed, background-checked, and respectful of your property—wearing shoe covers and using drop cloths on every job.
Emergency plumbing issues never happen at a convenient time. That is why we offer same-day service for burst pipes, sewer backups, and water heater failures. We use modern diagnostic tools like camera inspections to find problems without destructive guesswork. For older homes, we specialize in relining drain pipes, avoiding costly excavation.
We also offer maintenance agreements to keep your plumbing system trouble-free. Low water pressure, running toilets, or corroded pipes—our team solves it all with honest, upfront pricing. Experience the peace of mind that comes from hiring Bismarck's most trusted plumbing experts.
04
Commercial Mechanical Construction
From design-build to prefab services, H. A. Thompson & Sons delivers turnkey mechanical solutions for commercial projects across Bismarck. We work with general contractors and property owners on new construction, retrofits, and energy conservation upgrades. Our scope includes HVAC piping, ventilation systems, boiler plants, and building automation controls.We use LINC Service protocols to ensure your building’s mechanical systems operate at maximum efficiency. Our prefabrication shop reduces on-...
From design-build to prefab services, H. A. Thompson & Sons delivers turnkey mechanical solutions for commercial projects across Bismarck. We work with general contractors and property owners on new construction, retrofits, and energy conservation upgrades. Our scope includes HVAC piping, ventilation systems, boiler plants, and building automation controls.
We use LINC Service protocols to ensure your building’s mechanical systems operate at maximum efficiency. Our prefabrication shop reduces on-site labor time and improves quality control. Whether you need a restaurant exhaust system or an office building chiller replacement, our project managers coordinate every phase to meet deadlines and budget.
We are proud to have maintained over 1,000 buildings throughout the northern plains. Our commercial team provides 24/7 emergency repair, routine contract maintenance, and capital planning assistance. Choose us as your mechanical partner and gain a team that cares about your bottom line as much as you do.
05
Plumber in Bismarck
Our plumbers handle the everyday and the difficult: leaking faucets, running toilets, water heater replacements, drain cleaning, and repiping whole homes. Every technician is licensed and background-checked, and we protect your floors with shoe covers and drop cloths on every visit. When we find a problem, we use camera inspections to see exactly what is happening before we start cutting into anything. You will get a clear, upfront price before work begins. If you have a plumbing concern in Bism...
Our plumbers handle the everyday and the difficult: leaking faucets, running toilets, water heater replacements, drain cleaning, and repiping whole homes. Every technician is licensed and background-checked, and we protect your floors with shoe covers and drop cloths on every visit. When we find a problem, we use camera inspections to see exactly what is happening before we start cutting into anything. You will get a clear, upfront price before work begins. If you have a plumbing concern in Bismarck, call us and we will tell you honestly what it needs.
06
Hvac contractor
Heating and cooling is a large investment, and we treat it that way. Our NATE-certified technicians handle system design, installation, repair, and maintenance for homes and commercial buildings. We begin with a detailed load calculation and a free estimate, then walk you through equipment options, efficiency ratings, and what each choice means for your monthly costs. Because we have worked in Bismarck for more than a century, we know how hard our winters are on equipment and plan around that. F...
Heating and cooling is a large investment, and we treat it that way. Our NATE-certified technicians handle system design, installation, repair, and maintenance for homes and commercial buildings. We begin with a detailed load calculation and a free estimate, then walk you through equipment options, efficiency ratings, and what each choice means for your monthly costs. Because we have worked in Bismarck for more than a century, we know how hard our winters are on equipment and plan around that. Financing and maintenance plans are available if they fit your budget.
07
Heating and cooling in Bismarck
Keeping a building warm in winter and cool in summer means choosing equipment that suits the space and the climate. We install and service furnaces, central air conditioners, and ductless systems, and we explain the tradeoffs before anything is ordered. Our technicians check airflow, refrigerant levels, and controls so the system runs as designed. Routine filter changes and tune-ups prevent most breakdowns, and when something does fail, we respond quickly. Call us to schedule an estimate or a se...
Keeping a building warm in winter and cool in summer means choosing equipment that suits the space and the climate. We install and service furnaces, central air conditioners, and ductless systems, and we explain the tradeoffs before anything is ordered. Our technicians check airflow, refrigerant levels, and controls so the system runs as designed. Routine filter changes and tune-ups prevent most breakdowns, and when something does fail, we respond quickly. Call us to schedule an estimate or a service visit.
08
Emergency plumbing services in Bismarck
Burst pipes, sewer backups, and failed water heaters rarely wait for a convenient time, so we offer same-day service for plumbing emergencies in Bismarck. Our crews arrive prepared to stop the damage first and then find the cause. We use camera inspections and modern diagnostic tools to locate problems without tearing up more of your property than necessary. Where pipes are old, relining can often repair them without costly excavation. Call our office as soon as you notice a problem and we will...
Burst pipes, sewer backups, and failed water heaters rarely wait for a convenient time, so we offer same-day service for plumbing emergencies in Bismarck. Our crews arrive prepared to stop the damage first and then find the cause. We use camera inspections and modern diagnostic tools to locate problems without tearing up more of your property than necessary. Where pipes are old, relining can often repair them without costly excavation. Call our office as soon as you notice a problem and we will get a technician out to you.
09
Residential hvac repair in Bismarck
When your heat stops or your air conditioner quits in the middle of a hot week, you need someone who can diagnose the problem quickly and correctly. Our technicians repair furnaces, central air systems, and related components in homes across Bismarck, and we explain what failed and what our options are before we start work. We also keep replacement parts on hand for common systems to reduce wait times. If repairs will cost more than the system is worth, we will say so plainly and help you compar...
When your heat stops or your air conditioner quits in the middle of a hot week, you need someone who can diagnose the problem quickly and correctly. Our technicians repair furnaces, central air systems, and related components in homes across Bismarck, and we explain what failed and what our options are before we start work. We also keep replacement parts on hand for common systems to reduce wait times. If repairs will cost more than the system is worth, we will say so plainly and help you compare replacement options with financing.
10
Commercial mechanical contractor in Bismarck
We design, install, and maintain mechanical systems for commercial buildings, working with general contractors and property owners on new construction, retrofits, and energy upgrades. Our scope covers HVAC piping, ventilation, boiler plants, and building automation controls, and we have maintained more than 1,000 commercial buildings across the northern plains. Our project managers keep schedules and budgets on track from planning through commissioning. We also provide 24/7 emergency repair and...
We design, install, and maintain mechanical systems for commercial buildings, working with general contractors and property owners on new construction, retrofits, and energy upgrades. Our scope covers HVAC piping, ventilation, boiler plants, and building automation controls, and we have maintained more than 1,000 commercial buildings across the northern plains. Our project managers keep schedules and budgets on track from planning through commissioning. We also provide 24/7 emergency repair and routine contract maintenance so your building keeps running after the project is finished.
11
Mini split installation in Bismarck
Ductless mini-split systems work well for additions, garages, and buildings without existing ductwork. As an authorized Mitsubishi Electric contractor, we install hyper-heat units that perform in cold Bismarck winters. We assess your space, recommend the right capacity, and handle the full installation, including mounting indoor units and connecting the outdoor condenser. Our technicians have factory training, and every project includes a workmanship guarantee. Because each room can be set indep...
Ductless mini-split systems work well for additions, garages, and buildings without existing ductwork. As an authorized Mitsubishi Electric contractor, we install hyper-heat units that perform in cold Bismarck winters. We assess your space, recommend the right capacity, and handle the full installation, including mounting indoor units and connecting the outdoor condenser. Our technicians have factory training, and every project includes a workmanship guarantee. Because each room can be set independently, you can heat and cool only the spaces you use. Contact us to discuss your space and what a mini-split would involve.
12
Furnace repair
A furnace that will not ignite or runs unevenly needs prompt attention, especially in a Bismarck winter. Our NATE-certified technicians diagnose the cause, whether it is a failed igniter, a clogged filter, or a control problem, and repair it so it runs safely and efficiently. We will tell you what the repair involves and what it costs before we begin. If the unit is near the end of its life, we can compare repair against replacement so you can decide with the full picture. Call us when your furn...
A furnace that will not ignite or runs unevenly needs prompt attention, especially in a Bismarck winter. Our NATE-certified technicians diagnose the cause, whether it is a failed igniter, a clogged filter, or a control problem, and repair it so it runs safely and efficiently. We will tell you what the repair involves and what it costs before we begin. If the unit is near the end of its life, we can compare repair against replacement so you can decide with the full picture. Call us when your furnace needs service.
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For over a century, H. A. Thompson & Sons has been the name Bismarck residents and businesses trust for exceptional plumbing, heating, air conditioning, and mechanical contracting. We are not just a service provider; we are a family-owned legacy built on unwavering service and a commitment to doing the job right the first time.
Our team understands that your home or business is your largest investment. That is why we bring legendary service to every call, using the latest technology, from Mitsubishi mini-splits to advanced energy conservation methods. As a proud LINC Service Contractor, we provide proactive Environmental Maintenance Agreements that keep over 1,000 commercial buildings in the northern plains running efficiently year-round.
When you choose us, you get more than a repair—you gain a partner. We offer transparent free estimates, flexible financing, and round-the-clock support because comfort should never wait. Let our fourth-generation team show you why we have been serving Bismarck with integrity since 1908.
