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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

in hammock
25,000 Days

On July 8, my body’s odometer went over 25,000 days. When life’s dial flipped to that number, I woke with wonder and thought, once again, that I probably should have chan...

Published on 07/24/2018 7:42 PM by Dan Holohan
Posted in The HVAC Business
baseboard
Baseboard: How Much Is Too Much?

So this hefty gent comes up to me after a hot-water seminar and tells me about a problem he's having with this copper-fintube baseboard loop he installed in this big hall...

Published on 07/07/2018 2:35 PM by Dan Holohan
Posted in Hot-Water Heating
bucket
The Leaky Bucket

The question was in the Manchester Evening News, a British newspaper, and it caught my eye when I was going through my daily Google Alerts on things that have to do with ...

Published on 06/26/2018 1:48 PM by Dan Holohan
Posted in The HVAC Business
right wrong
Never Wrong

So I’ve known this guy (let’s call him Jerry) for a very long time. We came up in the business together, and I like him. He’s a good guy, and if he lived next door he wou...

Published on 06/26/2018 1:46 PM by Dan Holohan
Posted in The HVAC Business
The Roots of Radiant Heating Seminar

This seminar was filmed on June 5, 2018 as part of the Labor Lecture Series at the General Society of Mechanics and Tradesmen of the City of New York. Radiant heating wit...

Published on 06/06/2018 1:28 PM by Dan Holohan
Posted in Hot-Water Heating
warranty
How to Talk Me Out Of It

We were once a five-car family. That was when the four daughters were in college. Three of them had cars, which The Lovely Marianne and I paid for, of course.

Published on 05/30/2018 10:42 AM by Dan Holohan
Posted in The HVAC Business
the contractor stories holohan
Buddy's Beaters

It wasn’t a very long list – just 25 people in all – but it nagged at Buddy in the night and robbed him of his rest. He’d toss and dream unsettling dreams of Mrs. Gibbing...

Published on 05/17/2018 2:37 PM
Posted in The HVAC Business
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....

Published on 05/09/2018 12:36 PM by Ray Wohlfarth
Posted in Steam Heating