At the end of last month's column (November, p. 40), I promised that we would look at the bottom line results of retrofitting variable speed pumps on a sample project. As I explained previously, for ...

An HVAC system’s energy efficiency is only as good as the engineering firm that monitors and upgrades it. Hemant Mehta’s WM Group must be doing something right because he and his team have been ...

This generation of variable-speed pumps can internally sense how many valves are open or closed and adjust speed accordingly. Variable speed pumps have been around for years. As I mentioned in last ...

Variable-speed options are abundant in HVAC and their impact has been felt industry-wide. Contractors and manufacturers alike have taken to these single- and two-stage alternatives as ways to enhance ...

It is interesting to look at figures from the Energy Information Administration about where energy gets consumed in our economy. These figures reveal that industrial uses account for 31% of all energy ...