Thermdynamics in Tea, SD is a major supplier of portable heaters for the oil and gas industry in the Williston Basin, the company has been impacted by the declining oil business. So owner, Rich Koopman, was contacted by another company to help with orders for the hospital business. “We are currently welding 400 bed frames per day with 22 people involved,” Koopman said. “We were contracted by Kooima Manufacturing.”