Johnstone Supply

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About Johnstone Supply
Johnstone Supply operates as a heating equipment supplier in Farmington Hills, Michigan, holding a 4.3-star rating across 21 verified reviews. This location functions primarily as a distributor serving HVAC contractors rather than residential homeowners directly. The facility maintains standard business hours Monday through Thursday from 7:30 AM to 4:30 PM, with Friday through Sunday closed. Contractors can request commercial accounts to access wholesale pricing and specialized contractor tools through their online portal.
The Farmington Hills location distinguishes itself through an extensive inventory spanning multiple HVAC categories. Their product lineup includes single packaged units, split systems, mini-split systems with both single and multi-zone configurations, variable capacity systems, residential unitary equipment, air handlers, evaporator coils, and both gas and oil furnaces. The commercial division offers specialized equipment for businesses, while the residential side covers everything from standard split systems to more advanced variable-speed options. Extended warranties are available on select equipment, providing contractors with additional service options for their clients.
Several contractors have shared specific experiences with this supplier. One reviewer noted the warehouse staff provided comprehensive assistance and maintained a well-stocked inventory, describing it as a preferred destination for technicians. Another mentioned fast service and consistent availability of needed parts. However, contractors should be aware that some negative reviews cite instances of receiving defective equipment and experiencing contentious interactions when seeking resolutions, including one case where legal representation was involved rather than direct problem-solving.
What Customers Say
Of 8 visible reviews, 5 award five stars citing inventory depth, staff knowledge, and pricing, while 2 one-star reviews describe receiving defective motors and unresolved disputes. The overall 4.3-star rating from 21 reviews suggests significant additional feedback beyond those displayed.
Working Hours
| Sunday | Closed |
| Monday | 7:30 AM–4:30 PM |
| Tuesday | 7:30 AM–4:30 PM |
| Wednesday | 7:30 AM–4:30 PM |
| ThursdayToday | 7:30 AM–4:30 PM |
| Friday | Closed |
| Saturday | Closed |
Services
Split Systems
Traditional split system air conditioners and heat pumps for residential and light commercial applications.
Mini-Split Systems
Ductless heating and cooling solutions available in single-zone and multi-zone configurations.
Variable Capacity Systems
Advanced systems with variable-speed compressors for enhanced efficiency and comfort control.
Single Packaged Units
All-in-one heating and cooling units suitable for tight installation spaces.
Gas Furnaces
Residential and commercial gas furnaces including high-efficiency models.
Oil Furnaces
Oil-fired heating equipment for applications without natural gas access.
Air Handlers & Evaporator Coils
Indoor units and coil components for split system installations.
Commercial HVAC Equipment
Light commercial heating and cooling equipment for business installations.