Geothermal Heating & Cooling | Tulsa OK | K & M Shillingford, Inc. tulsa ok, K and M Shillingford, geothermal heating, geothermal cooling, design and build, commercial air conditioner repair, commercial heating repair, hvac, solar heating, water heaters, commercial heating, commercial cooling, industrial heating, industrial cooling We are a design build mechanical contracting firm and offer professional integrity and a group of highly skilled and trained technicians to handle our clients’ each and every need.