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

The Point of No Pressure Change

In 1994, I wrote a book called, Pumping Away, which I began by remembering the late, great Gil Carlson. Here's what I wrote: When I knew Gil Carlson, he was never far fro...

Published on 06/18/2014 11:31 AM by Dan Holohan
Posted in Hot-Water Heating
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The Hidden Costs of Hidden Pumps

If you're watching the news you probably realize that, these days, Americans are becoming more conscious of green things, as well as rising fuel prices. I think that's go...

Published on 06/18/2014 11:26 AM by Dan Holohan
Posted in Hot-Water Heating
Gilbert Carlson
Net Positive Suction Head

I was lucky to have had as one of my teachers the late, great Gil Carlson. Gil was Bell & Gossett’s Director of Technical Services and when he would come to New York City...

Published on 06/18/2014 11:13 AM by Dan Holohan
Posted in Hot-Water Heating
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How to Size Circulators

In 1970, I went to work for a manufacturers rep on the Isle of Long and I fell in love with hydronics. We sold Bell & Gossett and one of the elder salesmen took me aside ...

Published on 06/18/2014 11:04 AM by Dan Holohan
Posted in Hot-Water Heating
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Boiler Ratings Explained

When you look in a boiler manufacturer's catalog you'll see that there are several types of ratings for each boiler. There's the Input rating, the Gross Output rating (wh...

Published on 06/18/2014 10:49 AM by Dan Holohan
Posted in Steam Heating and Hot-Water Heating