RTH Mechanical Contractors Inc has been awarded –  

2015 SBA National Subcontractor of the Year!








  • At RTH Mechanical Contractors, we are committed to performing quality work on Commercial Construction and Renovation Projects.
  • Our goal is to supply our customers with competitive pricing while keeping safety, quality, budget and schedule a priority.
  • We constantly strive to exceed our customers’ expectations

Project Management

  • We are a Veteran Owned Small Business established in 1986 with a strong reputation , high quality workmanship, competitive pricing and professional services.
  • We serve the Tri-State are of New Hampshire, Maine and Vermont and beyond.
  • We offer fully licensed mechanics (pipefitting, plumbing, med gas), ASME certified welders, QA Program ASME B31.1 and Professional Project Management and Design Services.

RTH Mechanical Services

  • Provides professional service for all commercial HVAC needs on a 24/7 basis.
  • Our preventative maintenance program implements a proactive approach to maintaining your equipment.
  • Replacements and installations on a wide range of HVAC equipment