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

Eureka Fitting Patent

Here is the patent for the Eureka fitting, which is an early diverter tee. Thanks to Gerry Gill for finding and sharing the patent.

Published on 06/16/2014 1:10 PM
Posted in Heating Museum
Flo-Control Valve Patent

Here is Gil Carlson's circa-1951 patent for the Bell & Gossett Flo-Control Valve. Thanks to Steve Pajek for finding and sharing this document. 

Published on 06/16/2014 1:08 PM
Posted in Heating Museum
Gravity Heating System Design

Thanks to Mike Thies for finding and sharing this chapter. He writes, "This is from the book, Heating Design and Practice, 1951, by Robert Henderson Emerick. While not re...

Published on 06/16/2014 1:06 PM
Posted in Heating Museum
H. A. Thrush & Company Catalog

Here's a look at the H. A. Thrush & Company product offering in 1946 for hot-water heating flow control valves, water circulators, pressure reducing valves, relief valves...

Published on 06/16/2014 1:04 PM
Posted in Heating Museum
Kriebel Hot Water System

Kriebel was very involved with steam heating and they made a device that worked in a similar way to Honeywell's Heat Generator. Thanks to Gerry Gill for finding this pate...

Published on 06/16/2014 12:53 PM
Posted in Heating Museum