Heating, Air Conditioning & Refrigeration Supplies

Serving Greater St. Louis, MO area

Contact Us Today!

We Have The Experience

Thompson Supply Company, located in Saint Louis, MO, specializes in providing HVAC-R parts, equipment, and supplies for residential, commercial, and industrial clients across Missouri and Illinois. Since 1935, we've proudly served the greater St. Louis area, with a particular focus on sourcing those hard-to-find parts. Our extensive inventory includes OEM and MRO aftermarket parts such as gas valves, thermostats, furnace control boards, draft inducers, motors, igniters, flame sensors, transformers, contactors, test instruments, and more. Please note, we are parts sales only and do not offer service repairs. We also welcome the public. Please be aware that electrical, gas control, and special order parts are non-returnable. For more information, contact us at 314-423-3700.

We have been providing products and services since 1935!

“Hard to Find” Is Our Specialty

More Than a Slogan;

It’s a Way of Life.

Industrial, Commercial, or Residential

Thompson Supply provides equipment, parts and supplies for your heating, ventilation, air-conditioning and refrigeration needs whether residential, commercial or industrial.

Wide Inventory in Stock

Thompson Supply, a third-generation family-owned business, has been proudly serving the greater St. Louis area since 1935. We are dedicated to offering timely and cost-effective solutions to our customers, maintaining an extensive inventory on hand while also having the ability to quickly source additional products as needed.

Original & Aftermarket

Our deep industry expertise enables us to provide both original equipment manufacturer (OEM) parts and aftermarket options, along with a wide range of maintenance and repair supplies.

Hard to Find is Our Specialty

"Hard to find is our specialty" isn't just a slogan—it's a way of life. Without the constraints of a catalog or corporate oversight, we go the extra mile every day to locate service parts that meet our customers' needs and keep their businesses running smoothly.

We Can Help!

Here are some of the services/parts that we offer:

  • Services/Parts A-E

    • A/C Whips
    • AC
    • Accumulators
    • Acetylene
    • Adhesive
    • Aftermarket
    • Air Bear Filters
    • Air Conditioner Parts
    • Air Conditioners
    • Air Handlers
    • Air Purifying
    • Aluminized Tape
    • Bearings
    • Belts
    • Black Iron Fittings & Pipe
    • Blower Motors
    • Blower Wheels
    • Boiler Controls
    • Brazing Alloy
    • Charging Scales
    • Chimney Liner Kits
    • Circuit Boards
    • Circuit Breakers
    • Cleaning Chemicals
    • CO2
    • Combustion Analyzers
    • Compression Fittings
    • Compressors
    • Condensate Pumps
    • Condenser Fan Motors
    • Condenser Pads
    • Controls
    • Copper Fittings & Tubing
    • Cutting Tools
    • Defrost Time Clocks
    • Digital Multimeter
    • Direct Drive Motors
    • Direct Spark
    • Driers
    • Duct & Fittings
    • Duct Booster
    • Duct Tape
    • Electrical
    • Electronic Air Cleaner
    • Expansion Valves

  • Services/Parts F-Q

    • Factory Parts
    • Fan & Limit Controls
    • Fan Blades
    • Flare Fittings
    • Flashlights
    • Flex Duct
    • Flue Brushes
    • Flush Kits
    • Flux
    • Foaminator
    • Freon
    • Furnace Motherboard
    • Furnace Parts
    • Furnace Pipe
    • Furnaces
    • Fuses
    • Gas Valves
    • Gauges
    • Glycol
    • Hard Start Kits
    • Hot Shot
    • Hot Surface Igniters
    • Hot Water Vents
    • Humidifier Pads
    • Humidity Testers
    • Hydronic Heating Valves
    • IAQ
    • Leak Detector Bubbles
    • Leak Detectors
    • Mineral Oil
    • Motors
    • MRO
    • Nitrogen
    • OEM Parts
    • Oils
    • One Shot
    • Oxygen
    • Phase Monitors
    • Piercing Valves
    • Pilot Assemblies
    • Pipe Insulation
    • Pleated Filters
    • POE Oil
    • Pressure Controls
    • Property MGT Supplies
    • PVC Fittings & Pipe

  • Services/Parts R-Z

    • R22
    • R404A
    • R410A
    • R422A
    • R422B
    • Recovery Machine
    • Recovery Tank
    • Refrigerant Parts
    • Refrigerants
    • Refrigeration
    • Refrigeration Oil
    • Registers
    • Regulators
    • Return Air Grills
    • Sequencers
    • Shafts
    • Sheet Metal
    • Sheet Metal Screws
    • Sheet Metal Tools
    • Sight Glasses
    • Solder
    • Solenoid Valves
    • Steam Vents
    • Suva
    • Temperature Controls
    • Terminal Wires
    • Thermocouples
    • Thermostats
    • Transformers
    • TXV Valves
    • Vacuum Pump Oil
    • Vacuum Pumps
    • Ventilation
    • Ventilation Eliminators
    • Water Panels
    • Whips
    • Wire Nuts
    • Wire Ties
    • And More …

-Lancaster A.-

"The owner was very good at getting us everything we needed. He is very knowledgeable and very informative. Recommend him and his store."

-Roger D.-

"These guys are fantastic! They were there on a Saturday and had the part I needed in stock. Most other places won't sell to the public. These guys not only sell to the "do it yourselfer", but they also recommended another part (absolutely no pressure to upsell) to help my aging system work better in this hot St. Louis weather. Definitely recommend and they have earned another customer!"

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-Vern A.-

"In short, my furnace started to make a loud noise last night about 4pm. I called Thompson's and talked with a guy named Gary. I told him I thought the first fan motor was bad, not the big one. He replied. 'I know I have the part, just take it off and bring it in'. Today I did, and he had the part just sitting on the shelf waiting for me. 'Wow', is all I can say. 35 Minutes after getting home, my furnace is running quieter than it ever did, and it's all thanks to Thompson's. My family and I are very grateful. Thanks! I'll be back if I ever need parts, and I'm going to tell everyone how great your customer service is."

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-April G.-

I just want to say how AMAZING Mr. David was with helping me fix my furnace. He was so helpful and had great customer service and had every part I needed to get the job done. I've never worked on a furnace before, but after completing YouTube University (lol), and Mr. David assisting me (with every question I had and even giving me information I didn't know to ask), it was fixed. If you ever need the right parts, Thompson's Supply is your one-stop shop. Stop by and see Mr. David. He will make sure you get the job done.

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-Kordero S.-

I'm from Memphis and forgot 1/4 access valves during Labor Day weekend, and he was the only supply house I could find. He was a heaven-sent man.

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-Kendall M.-

Thompson Supply Company has earned my business. Their knowledge and reasonable prices are outstanding. I would recommend them to anyone in the area that needs parts and knowledge for their HVAC system.

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