About Us

After 24+ years operating as Johnstone Supply of Philadelphia, David Whitnack Distributing, Inc. has changed its name to Keystone Supply Group.

Our loyal and valued customers should expect the same excellent HVACR products, service and attention as in the past, with even more flexibility in product offering and customer support. As a fully independent wholesaler, with no marketing restrictions, our vendors' local representatives should also look forward to the opportunity to work more closely with our staff to communicate the virtues and strengths of their products with our existing customers, and gain market share elsewhere through extensive web marketing, customer education and training.

Keystone Supply Group is wholesale only. Identification may be required of purchasers. Prices are net wholesale, subject to change without notice, and quoted once an account - whether PayPal/credit card or credit line, if established. Prices will only be quoted after proof of trade is shown. Quantity prices will be quoted upon request. It is our policy to ship all orders the same day as received (prior to 3:30pm eastern time). Open account terms are available to companies with established credit. Past due accounts may be subject to a service charge

Keystone Supply Group will process all warranties in accordance with the manufacturer's specific warranty policies and procedures. Please contact us or visit our Manufacturer Listing for additional warranty information. All returns are subject to a restocking charge. Material Safety Data Sheets (MSDS) are available upon request or can be downloaded from the vendor’s web page.