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Bob and Tim were at the shop after a day of service calls. The weather was still hot, 93°F, and Bob said, “We just did a service call with a system that was overcharged and had an orifice expansion device. I would like to go into further details with you on a system with a thermostatic expansion valve (TXV) for an expansion device.”

This multiple-part article series will discuss the basics, codes and standards, and the science behind chimneys. It will show how back drafting affects chimney performance, while explaining the principles of positive pressure. It will explain how to create and use positive pressure so chimneys will draft for safety and performance.

NLRB actions and court decisions have taken the issue of joint employers, independent contractors, and leased employees far beyond a single industry. These changes could profoundly impact the liability and responsibility companies have regarding contractors and contingent employees.

Researchers at the A*STAR Institute of Materials Research and Engineering and the National University of Singapore believe they have created a powerful magnetic refrigerant that is easy to make in the lab, reports the nanotechnology journal nanowerk.

InsideIQ Building Automation Alliance member firms MC2 and CM3 have completed building automation system (BAS) and energy efficiency projects for two Florida Hospitals. Both firms are experienced providers of automation and energy management systems for a variety of commercial buildings, including health care facilities.

Homeowners want ways to save energy and cut costs. HVAC contractors are looking for new business opportunities. And technologies like thermal imaging enable you to see and do more than ever before. Why not bring customer needs, technology, and your skills together by offering home energy audit services? Here’s how.

A growing number of household and building operations can be managed via the Internet. Today’s smart homes and smart buildings promise convenient, efficient building management. But often these systems are not secure. Scientists are working on a software product that defends against hacker attacks before they reach the building.

As an HVAC contractor, your focus is likely on everything but your website. This is completely understandable, especially when the phones are ringing. Here are some easy tips to get your website working for you, building your business every day of the year.

Two years after contaminated cooling towers led to a Legionnaires’ disease outbreak in Edinburgh hospitals, the message about proper maintenance is more important than ever.

Field demonstrations of newly proven energy efficiency technologies are yielding valuable results for the U.S. Navy, helping it meet energy goals. The initial results have encouraged the Navy to move forward with broader implementation of several of the energy efficiency technologies.