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

Jarecki Radiators (1890)

Here are ratings for the Erie radiator from Jarecki Mfg Co Ltd. They were based in Erie, PA and their radiators appeared in issues of Domestic Engineering in the 1890s. 


Published on 04/22/2024 4:07 PM
Posted in Heating Museum
A History of the Radiator

Brian Roberts & Paul Yunnie compiled this document that contains beautiful vintage advertisements and illustrations of radiators from the mid to late 1800s and early 1900...

Published on 02/07/2024 2:34 PM by Brian Roberts & Paul Yunnie
Posted in Heating Museum
dan and marianne holohan
Dear Reader

Hello, old friend. I’m writing today to say thanks, and to say farewell. This will be my last column.

Published on 12/06/2023 12:34 PM by Dan Holohan
Posted in The HVAC Business
piped steam boiler
Subdural’s Triumph

Subdural posed a question on The Wall at in the Strictly Steam section, where some of the sharpest knives in the drawer post every day. The question was a...

Published on 12/06/2023 11:25 AM by Dan Holohan
Posted in The HVAC Business
Do Wholesalers Still Design Systems?

I know that some wholesalers still size equipment and design systems for their contractor customers, but I wondered to what degree this still goes on nowadays. So I asked...

Published on 12/06/2023 11:16 AM by Dan Holohan
Posted in The HVAC Business
Do You Teach Your Customers?

I was a teacher for a manufacturers rep in New York for more than 10 years. I decided to go out on my own in 1989 and helping me make that decision was the fact that the ...

Published on 11/15/2023 3:24 PM by Dan Holohan
Posted in The HVAC Business
Why Is It So Hard To Hire A Contractor?

A Wall Street Journal writer got in touch with me last summer and asked if she could interview me. She was working on an article about why it was so hard to hire a contra...

Published on 10/01/2023 12:46 PM by Dan Holohan
Posted in The HVAC Business