Johnstone Supply of New Castle, Delaware

Johnstone Supply of New Castle, Delaware Johnstone Supply is a wholesale distributor serving HVACR professionals. Johnstone Supply is a wholesale distributor serving professional HVACR contractors.

Johnstone has the largest selection of equipment and genuine OEM parts in the industry. We have replacements for nearly every major brand and an extensive cross reference that makes sourcing hard-to-find parts easy. Johnstone Supply: Making it Easier to do Business.

The April Power Deal is here! Save $4 on the 45/5 microfarad Titan HD Run Capacitor when you purchase online. Log in now...
04/03/2026

The April Power Deal is here! Save $4 on the 45/5 microfarad Titan HD Run Capacitor when you purchase online. Log in now to claim this exclusive deal, now backed by an extended 10-year warranty.

04/02/2026

2026 Johnstone TNT flyer available in-store today!

April's Supplier of the Month is AprilAire and they're making it easier than ever to add IAQ to every job. This month on...
04/01/2026

April's Supplier of the Month is AprilAire and they're making it easier than ever to add IAQ to every job. This month only: buy 6 Wi-Fi dehumidifiers, get 1 free + two free water sensors. Stop in and ask us how IAQ can work on your next job.

Learn how the refrigerant cycle really works, and use that knowledge to diagnose systems faster, with confidence. The co...
03/27/2026

Learn how the refrigerant cycle really works, and use that knowledge to diagnose systems faster, with confidence. The course, 141 Refrigeration 1, focuses on practical, field-tested troubleshooting for both AC and refrigeration equipment. Save 20% for the month of March with the coupon code LUCKY20. Visit JohnstoneUniversity.com to learn more.

Just one week remaining with our March Power Deal on the EZ Trap Condensate Trap from RectorSeal. Find time to take adva...
03/24/2026

Just one week remaining with our March Power Deal on the EZ Trap Condensate Trap from RectorSeal. Find time to take advantage of this online-only $5 off discount before the end of the month.

03/20/2026

Missed out on AHR in Vegas? Get some quick tips form the RectorSeal booth. Shop all products online now at JohnstoneSupply.com/RectorSeal.

Win more multifamily and light commercial jobs with ecobee SmartBuildings. Works with any ecobee thermostat and gives yo...
03/18/2026

Win more multifamily and light commercial jobs with ecobee SmartBuildings. Works with any ecobee thermostat and gives your customers secure remote access and centralized control with easy setup for you. Ask our counter staff to get started.

Plan your spring maintenance calls and check your records! RGF In-duct Air Purifier replacement cells may be due. Have c...
03/16/2026

Plan your spring maintenance calls and check your records! RGF In-duct Air Purifier replacement cells may be due. Have cells on hand and keep systems performing at their best by stocking up at Johnstone Supply.

03/13/2026

…one of those T’s has to mean toys…right? Tool & Test flyer available now at all Johnstone locations!

Introducing the NEW ElitePRO™ S1200 thermostat, now with EIM from Honeywell Home. The Equipment Interface Module solves ...
03/11/2026

Introducing the NEW ElitePRO™ S1200 thermostat, now with EIM from Honeywell Home. The Equipment Interface Module solves wiring challenges for you, expands system control, and supports sensors and IAQ devices. Stop by the counter today to learn more about the smart way to simplify.

03/09/2026

Buy 3 cylinders of qualifying refrigerant during the month of March and….
✅ Get this Leatherman Wave+ Multitool.
✅ Strip wires.
✅ Tighten a loose panel screw.
✅ Open 4 packages from Johnstone.
✅ Perfect your indoor landscaping.
✅ Make your lunch.
Thank goodness you bought that refrigerant.

Address

10 Commons Boulevard
New Castle, DE
19720

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

+13023239600

Website

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