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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

My Friend's Mansion

I’ve known him for most of my career. He’s a Hasidic Jew from Brooklyn, NY. He’s absolutely delightful and he talks faster than I can think.

Published on 08/21/2023 4:25 PM by Dan Holohan
Posted in The HVAC Business
Advice for Newbies

Ray Wohlfarth is a dear friend of many years and his advice about commercial boilers often appears in this magazine. He’s the best big-boiler guy I’ve ever met and he als...

Published on 08/21/2023 4:13 PM by Dan Holohan
Posted in The HVAC Business
Vetter Weingarten solar roof
Another Solar Myth Bites the Dust

Way back in 1978, I (Larry) installed my first solar water heating system. I continued with solar thermal, installing new domestic hot water (DHW), space, and pool heatin...

Published on 08/21/2023 3:13 PM by Larry Weingarten and Zak Vetter
Posted in Solar
Close to Perfect?

I always enjoy looking at photos of their own work that Wallies post on The Wall at It’s not easy to do because The Wall is home to some of the sharpest ...

Published on 07/26/2023 3:32 PM by Dan Holohan
Posted in The HVAC Business
Magical Thinking

It was one of those days at when the old guys had the floor. One of the regulars, a retired (and understandably crotchety) fella from Canada had this to s...

Published on 06/06/2023 11:08 AM by Dan Holohan
Posted in The HVAC Business
Freezing Univentilator Coils

I had written a story for Plumbing & Mechanical a while back about a fella in Canada who sent me this email: "Our problem is that five out of hundreds of univentilator co...

Published on 05/08/2023 3:15 PM by Dan Holohan
Posted in Steam Heating