Heating, Air Conditioning & Refrigeration Supplies Since 1935

Thompson Supply Company in Saint Louis, MO, provides heating, ventilation, air-conditioning, and refrigeration (HVAC-R) parts, equipment, and supplies for residential, commercial, and industrial clients in Missouri and Illinois. We have served the greater St. Louis Area since 1935, and we focus on providing solutions for those hard-to-find parts. OEM and MRO aftermarket parts include gas valves, thermostats, furnace control boards, draft inducers, motors, igniters, flame sensors, transformers, contactors, test instruments, and more. Parts sales only - no service repair. We welcome the public. Electrical, gas control, or special order parts are not returnable for refund, credit, or exchange. To learn more, give our team a call today. We can be reached at 314-423-3700.

“Hard to Find Is Our Specialty”

More Than a Slogan;

It’s a Way of Life.

Call Today

“Hard to Find Is Our Specialty”

More Than a Slogan;

It’s a Way of Life.

Call Today

Residential, Commercial or Industrial

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

Serving the greater St. Louis area since 1935, Thompson Supply, as a third generation family-owned and operated business, continues to provide our customer with solutions that are timely and economical. We maintain a wide inventory in stock with the flexibility to rapidly source other products as needed.

Fuses on the Panel With Connectors — St. Louis, MO — Thompson Supply Company

Metal AC-DC Power Supply — St. Louis, MO — Thompson Supply Company

Original and Aftermarket Parts

Extensive knowledge of our industry allows us to offer both original equipment manufacturers and aftermarket parts along with a broad variety of maintenance and repair supplies.

Hard to Find is Our Specialty

“Hard to find is our specialty” is more than a slogan; it’s a way of life. Not limited by a catalog or a corporate office, we live it every day to source service parts for our customers to meet their needs and support their business.

Air Conditioning Compressor — St. Louis, MO — Thompson Supply Company

We Can Help With:

A/C Whips

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

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

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 …

Our Reviews

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 need 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. If you ever need the right parts , Thompson Supply is your one stop shop. Stop by and see Mr. David he will make sure you get the job done.
- April G.

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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 heaven sent man
– Kordero S.

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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.
– Kendall M.
The owner was very good at getting us everything we needed. He is very knowledgeable and very informative. Recommend him and his store.
– Lancaster A.
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 but 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!
- Roger D.
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 an 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 then it ever did and its all thanks to Thompsons. My family and me are very grateful Thanks Ill be back if I ever need parts and I'm going to tell everyone how great your customer service is.
– Vern A.

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 need 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. If you ever need the right parts , Thompson Supply is your one stop shop. Stop by and see Mr. David he will make sure you get the job done.
- April G.

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Slide title

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 heaven sent man
– Kordero S.

Button
Slide title

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.
– Kendall M.
The owner was very good at getting us everything we needed. He is very knowledgeable and very informative. Recommend him and his store.
– Lancaster A.
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 but 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!
- Roger D.
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 an 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 then it ever did and its all thanks to Thompsons. My family and me are very grateful Thanks Ill be back if I ever need parts and I'm going to tell everyone how great your customer service is.
– Vern A.