Johnstone Supply

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About Johnstone Supply
Johnstone Supply operates as Branch 21 in Irwindale, California, functioning as an HVAC equipment distributor serving contractors and trades professionals in the greater San Gabriel Valley region. The Irwindale location holds a 4.5-star average rating drawn from 30 customer reviews, with operating hours extending from 7 AM to 5 PM on weekdays and Saturday morning availability. This location specializes in wholesale distribution of heating and cooling equipment including furnaces, split systems, mini-split configurations, air handlers, and evaporator coils.
The Irwindale branch distinguishes itself through extensive inventory depth and knowledgeable counter staff who assist contractors with cross-referencing parts and tracking down specialized components. Website listings indicate product categories spanning residential unitary systems, commercial packaged units, variable capacity systems, and multi-zone configurations. The distributor maintains partnerships with major manufacturers in the HVAC sector, offering both field-installed accessories and extended warranty programs for equipment purchases.
Customer reviews highlight specific team members including Fernando, Gino, and Jorge who have assisted contractors with same-day part procurement and problem-solving for unusual repair scenarios. One reviewer described the team tracking down a specific relay needed to repair an AC condenser unit, while another noted the staff's willingness to have orders ready for pickup when contractors need immediate access to parts. The Irwindale location serves as a resource for professionals handling installation, maintenance, and emergency repair work.
What Customers Say
Six of eight reviewers award 5 stars, with recurring mentions of same-day part availability and staff willingness to track down hard-to-find components. The two middle-rated reviews (3 and 5 stars) cite knowledgeable staff as a consistent strength, while one 3-star review notes occasional moments of inattentiveness at the counter.
Working Hours
| Sunday | Closed |
| Monday | 7 AM–5 PM |
| Tuesday | 7 AM–5 PM |
| Wednesday | 7 AM–5 PM |
| Thursday | 7 AM–5 PM |
| Friday | 7 AM–5 PM |
| SaturdayToday | 8 AM–12 PM |
Services
HVAC Equipment Distribution
Wholesale supply of heating and cooling equipment to licensed contractors and trades professionals.
Furnace Supply
Gas furnaces and oil furnaces available for contractor purchase and installation.
Split System Components
Split system air conditioners, heat pumps, and associated components in various capacities.
Mini-Split Systems
Mini-split configurations including single-zone and multi-zone system options.
Air Handlers & Evaporator Coils
Air handlers and evaporator coils for residential and light commercial applications.
Commercial Packaged Units
Commercial single-packaged units for larger-scale HVAC installations.
Parts Cross-Referencing
Staff assistance with part identification and cross-referencing for hard-to-locate components.
Will-Call Order Pickup
Orders pulled and held for contractor pickup, with some reviewers noting same-day availability.