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

Thatcher Garage Heaters

This excerpt from a May, 1931 Thatcher Boilers and Radiators booklet showcases the Thatcher Garage Heating System. It begins, "Experienced car owners will testify that th...

Published on 01/18/2023 3:07 PM
Posted in Heating Museum
That Seventies Show

I began my career in the HVAC business in 1970 as a truck driver for an AC/refrigeration wholesaler. I stayed there just six weeks because my father — who worked for a ma...

Published on 01/11/2023 11:51 AM
Posted in Heating Museum
questions clipboard
A Homeowner's Challenge

I wrote a book for homeowners in 2003 and called it We Got Steam Heat (with apologies to The Pajama Game). I wrote that book because I had written another book 11 years e...

Published on 12/16/2022 12:21 PM by Dan Holohan
Posted in The HVAC Business
counter person
What Makes for a Good Counter Person?

I asked the many contractors who post regularly on The Wall at to tell me what they like (and don’t like) about the counter people at their suppliers. Her...

Published on 08/04/2022 11:36 AM by Dan Holohan
Posted in The HVAC Business
It's Just What I Do

Some years ago, a wholesaler hired me to do a seminar in a New England hotel for about 100 of his contractor customers. After the seminar, the owner of the company invite...

Published on 08/03/2022 1:09 PM by Dan Holohan
Posted in The HVAC Business
Why It's So Hard to Find Workers

I went to high school in the mid-1960s. All of the students had to take a “shop” class during the course of our time there. The Lovely Marianne, being female, was guided ...

Published on 07/20/2022 2:09 PM by Dan Holohan
Posted in The HVAC Business
HC uphill
What's In The Way?

In the city of Worcester, Massachusetts, which snuggles into the center of the state, you will find Mount Saint James, and upon that steep hill you will find The College ...

Published on 06/06/2022 12:10 PM
Posted in The HVAC Business
Air Vents and Steam System Corrosion

I hope we’re at the point where we can agree that proper venting is going to save fuel and balance systems. Not only does air slow the steam down, it also acts as a great...

Published on 05/26/2022 9:02 AM by Dan Holohan
Posted in Steam Heating