HVAC systems are truly amazing machines in making indoor comfort and air quality achievements without a glitch, both in houses and offices. There is a very big difference between residential and commercial HVAC contractors Freehold NJ that many don't realize. While contractors of both types work in heating, ventilation, and air-conditioning systems, the vastness of setup, complexity, and requirements of a job greatly differ. Knowing how these differ can help you hire the right professional for the job-if it is a homeowner upgrading his system or a business owner handling a large facility.