G.W. Berkheimer (Marzullo Supply Co)

G.W. Berkheimer operates as Marzullo Supply Co, a family-owned HVAC parts and accessories distributor serving Evergreen Park and the broader Chicago south suburban region. Located at 4258 W 95th St in Evergreen Park, this supply house has built its reputation over decades as a trusted source for contractors and serious DIYers alike. The business maintains a 4.5-star rating derived from 36 Google reviews, a strong indicator of consistent service quality. Their physical storefront operates Monday through Friday from 7 AM to 4 PM, with Saturday hours from 8 to 11 AM for will-call pickups.

Unlike typical HVAC contractors who focus on installation and repair labor, G.W. Berkheimer functions as a specialized supply house stocking equipment, parts, and accessories that other contractors rely upon daily. The business carries a broad product catalog spanning multiple major brands, allowing customers to source hard-to-find components. Their counter staff possesses deep technical knowledge, a recurring theme in customer feedback, and can often identify the right part from minimal description, saving customers valuable troubleshooting time.

Customer reviews consistently highlight three staff members by name: Mark, Joe, and Tom. Reviewers describe these technicians as knowledgeable, friendly, and capable of locating obscure parts quickly. One long-term customer notes a 25-year relationship with the business, while another mentions consistent same-day availability. A recent reviewer noted the team helped solve a problem other suppliers could not address, underscoring their technical depth and willingness to assist with non-routine inquiries.