OHC Supply: The Total Builders Resource. OHC Supply has developed a standing reputation based on quality and its commitment to customer service. Supported by professionally trained staff and a 10,000 sq. ft. Builders Resource Center, OHC is the Total Builders Resource. OHC is your one-stop solution provider for fireplaces, windows, doors, insulation, millwork, interior hardware, and more. And, we install it, too.