Dual Temp is a leader in mechanical engineering specializing in design, build and service of HVAC/R, Plumbing and Automated B ... uilding Control Systems in Eastern Pennsylvania. We are a privately owned, full service mechanical contractor, not a division of any utility company or consolidator, and have been since 1970. Dual Temp Designs, manufacturers, installs, and services HVAC/R and Plumbing systems for institutional, industrial, and commercial customers utilizing the latest technology related to BIM Engineering and Video Capture Service Call Management. read more