How to Calculate Steam Velocities
Every effort was made to verify the validity of the formulas but we are not responsible for errors and omissions. These do not take the place of engineering calculations....
Systems Help Center
Our comprehensive HVAC Systems Help Center covers a wide range of HVAC-related topics, including air conditioning and heat pumps, geothermal, hot-water heating, thermostats and controls, solar, steam heating, and warm air. We also have a section of informative and entertaining articles to help you sharpen your HVAC business skills. And our Heating Museum is a captivating journey through the evolution of HVAC technologies.
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Recent Articles
Hands In Pockets, Please
Have you ever found yourself in some dank basement staring at (and totally appreciating!) the simple beauty of some old one-pipe, gravity-return steam heating system? You...
A Copper Mystery
We’ve lived in this little house in Bethpage, NY since 1977. Bethpage was once home to Grumman, which built fighter planes, canoes, campers, buses, and the Apollo Lunar M...
How Much Should I Charge?
That’s the title of a fine book by my dear friend, Ellen Rohr. Ellen wrote it years ago and she offers great advice to anyone in business who’s looking to stay in busines...
A Nagging Need to Know
I got a letter from a friend who is a relocated New Yorker. He now lives in a part of America where people with excess money build second homes that they’ll use for a few...
Emissive Tests of Paints for Decreasing or Increasing Heat Radiation from Surfaces
This document, published in 1924 by the Department of Commerce Bureau of Standards, contains information about Emissive Tests of Paints for Decreasing or Increasing Heat ...
A Hartford Loop Q & A
Paul DuPont, a consulting engineer in Portland, Oregon, dropped me a line and suggested I write a bit about Hartford Loops - how they came to be, what they do, when you s...
A Good Time to Check a Vacuum Steam System
Why do we work on heating systems during the winter? Because we’re working on air-conditioning systems during the summer! Makes sense in a last-minute, panicky way, but i...
Coffee with Caleffi: Air Vents and Air Separators
The ideal fluid in a hydronic heating or cooling system is a fluid without any impurities, air bubbles or dissolved gases. But how is that accomplished? Kevin Freidt, dir...
Saving History
Step off of West 44th Street and into the lobby and look to your left. The artists (and we must call them that) who crafted that magnificent marble staircase were masters...