Johnstone Supply of Dover, Delaware

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Johnstone Supply of Dover, Delaware Johnstone Supply of Dover, DE is a HVAC/R Wholesale Supply House. From equipment, to parts, to supplies you can be confident Johnstone has what you need today.

Johnstone Supply Dover is a leading HVAC/R Wholesale Distributor with access to over 70,000 locally stocked products and inventory so you can get it same or next day in most cases. Our product selection is continually growing to meet the needs of HVACR contractors to ensure we have the best brands and technology. Plus, our relationships with hundreds of the industry's top manufacturers give you access to a million special order parts. Johnstone Supply: Making it Easier to do Business.

No matter what type of job you’re working on, Bosch has the quality system options to help you get the job done. From in...
10/23/2026

No matter what type of job you’re working on, Bosch has the quality system options to help you get the job done. From inverter ducted systems to ductless mini-split heat pumps, plus access to their condensing boilers and hybrid electric water heaters, you can find even more solutions from a single, trusted partner. Visit your local Johnstone Supply to ask about Bosch’s heating, cooling, and hydronics solutions, or shop all products at JohnstoneSupply.com/Bosch.

Just 10 days remaining with our October Power Deal on the Malco Reversible Hex Driver. Find time to take advantage of th...
10/22/2026

Just 10 days remaining with our October Power Deal on the Malco Reversible Hex Driver. Find time to take advantage of this online-only $4 discount before the end of this month.

There's an Ecobee for any budget. Lite, Enhanced, or Premium, plus an easy-to-use app and a clean interface to keep your...
10/21/2026

There's an Ecobee for any budget. Lite, Enhanced, or Premium, plus an easy-to-use app and a clean interface to keep your customers feeling in control. Shop the full lineup online at JohsntoneSupply.com or search for “Ecobee” in the Johnstone app.

Select Resideo universal parts are buy 2 and save, only at Johnstone Supply this month. Gas valves, ignition controls, h...
10/16/2026

Select Resideo universal parts are buy 2 and save, only at Johnstone Supply this month. Gas valves, ignition controls, hot surface igniters, fan timers, and thermocouples. Keep the parts you need on your truck and cover your next few calls, no matter what the job turns out to be. Stop by to stock your truck today.

10/14/2026

TECH TIP: Customers complaining of loud noises when the heatpump goes into a defrost cycle? Solve it using the reversing valve delay. Manufacture default is set to 30 seconds. Reduce the pressure in the system, reduce noise, and reduce customer concern and callbacks with one easy switch.

Installed during COVID? It’s time to replace the units installed during the COVID IAQ surge in 2020. Replace with a new ...
10/12/2026

Installed during COVID? It’s time to replace the units installed during the COVID IAQ surge in 2020. Replace with a new cell to maintain performance and avoid callbacks. Check your records, restock, and schedule replacement. Johnstone Supply stocks the replacement cells for REME HALO, REME HALO Zero, HALO-LED, and more. Visit us in-store today to see which one would be the best fit for your project.

Fujitsu’s eco-friendly R-32 product lines are a perfect blend of innovation, performance, and efficiency to meet all you...
10/09/2026

Fujitsu’s eco-friendly R-32 product lines are a perfect blend of innovation, performance, and efficiency to meet all your application needs. The newly expanded* line of multi-zone systems share common indoor units with their single-zone systems so you can increase your installation flexibility without sacrificing functionality. Visit JohnstoneSupply.com/Fujitsu to learn more about Fujitsu's R-32 ductless mini-split systems.

10/07/2026

Are you ready to rock? Enter for a chance to win The Ultimate Fan Experience Giveaway to see the Masters of Metal live in Las Vegas! Enjoy a VIP trip with luxury accommodations, round-trip airfare, and premium tickets for an immersive concert experience. Enter to win through October 31st. You’ll be off to never-never land!
Thanks to our key sponsors, Goodman, Rectorseal, Bosch, Fujitsu, Colman, Comfort-Aire, and Resideo.

The October Power Deal is here! Save $4 on a Reversible Hex Driver from Malco when you purchase online or in the new mob...
10/05/2026

The October Power Deal is here! Save $4 on a Reversible Hex Driver from Malco when you purchase online or in the new mobile app. Log in now to claim this exclusive deal on the 1/4" and 5/16" hex driver.

One part can cover a wide range of applications with White-Rodgers, our October Supplier of the Month. Their gas valves ...
10/02/2026

One part can cover a wide range of applications with White-Rodgers, our October Supplier of the Month. Their gas valves and ignition controls mean you can fix it on the first trip. And with a Connect Control like the All Spark, you can set things up from your phone before you're even on site. Ask at the counter about all the universal parts from White-Rodgers or shop online at JohnstoneSupply.com.

09/08/2026

Our teammate Randy Ambroselli, Technical Service Advisor, is putting a common HVAC myth to the test! 🧪

Think you can wait to replace your air filter? Randy breaks down what the science says—and why timely filter changes matter for airflow, efficiency and indoor air quality.

Watch the reel, then tell us: What HVAC myth should Randy test next? 👇

⚡ The September Power Deal is here! ⚡Save $25 on the PRO1 Universal Wi-Fi Thermostat when you purchase online or through...
09/04/2026

⚡ The September Power Deal is here! ⚡

Save $25 on the PRO1 Universal Wi-Fi Thermostat when you purchase online or through the new Johnstone Supply mobile app!

Log in now to claim this exclusive September deal on a versatile thermostat designed to fit a wide range of systems.

📅 September 1–30, 2026
📱 Online & Mobile App Exclusive
⚠️ While supplies last.

Log in. Add to cart. Save $25.

Address

890 New Burton Road
Dover, DE
19904

Opening Hours

Monday 7am - 4:30pm
Tuesday 7am - 4:30pm
Wednesday 7am - 4:30pm
Thursday 7am - 4:30pm
Friday 7am - 4:30pm
Saturday 8am - 12pm

Telephone

+13028836300

Website

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