Dring is an experienced, family-owned heating, air conditioning, installation and repair materials and services provider for trusted Carrier air, Lennox air, Goodman air and other manufacturers, servicing the Dallas Metroplex that includes University Park, Plano, Carrollton, and surrounding areas. Dring offers expert service technicians, fast response, and optional maintenance agreements for new and existing HVAC systems to ensure year-round ac cooling and furnace heating. Established in 1953.