Johnstone Supply

Johnstone Supply in Simi Valley operates as a heating equipment supplier serving contractors and property managers across Ventura County since the early 1990s. With a perfect 5.0-star rating from 3 verified reviews, this independent dealer stocks residential and commercial HVAC components including split systems, packaged units, furnaces, and air handlers. The Simi Valley location operates Monday through Friday from 7 AM to 5 PM and Saturday mornings, providing will-call pickup for licensed contractors performing installations in Moorpark, Thousand Oaks, and surrounding communities.

Unlike big-box retailers, Johnstone Supply carries specialty equipment such as mini-split systems, variable capacity systems, and extended warranties not typically available to general consumers. The store offers commercial refrigeration components and field-installed accessories that independent technicians rely on for custom ductwork and complex retrofit projects. Their contractor account program and credit application process enable professional buyers to access equipment directly, bypassing retail markup.

Homeowners who have called Juan and Michael report fast, knowledgeable assistance with parts identification and compatibility questions. One reviewer praised the team's ability to match legacy furnace components for older Simi Valley homes when other suppliers drew blanks. The Saturday morning window accommodates rush jobs requiring same-part replacements before Monday installations.