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

O-E Perfect System

The O-E Perfect System was a Turn-of-the-Century vapor heating system, simply described and pictured in this document. Thanks to Alex Marx for scanning this one for us, a...

Published on 06/16/2014 3:42 PM
Posted in Heating Museum
Piping Design for Oil Firing

In this 1933 Fuel Oil Journal article, O.O. Oaks, Chief Engineer for the American Radiator Company, explains the effect automatic firing has on a steam system that was pi...

Published on 06/16/2014 3:38 PM
Posted in Heating Museum
Vapor Heating: The Richardson System

The Richardson System of vapor heating was popular in the 1910s and 1920s. It's very simple, and you must run it at very low pressure (less than 1 psig) on a vaporstat. T...

Published on 06/16/2014 3:33 PM
Posted in Heating Museum
Sarco Return Traps

Sarco made a boiler-return trap that was widely used back in the day. Here is their literature on the product, as well as the accessories that went with it. Thanks to Pat...

Published on 06/16/2014 3:27 PM
Posted in Heating Museum
Six Kinds of Steam Heat

"Six Kinds of Steam Heat" subtitled, "Six ways to recapture the residential heating market," is an interesting article from the May, 1941 edition of Plumbing & Heating Bu...

Published on 06/16/2014 3:25 PM
Posted in Heating Museum
Skidmore Vacuum Pump

Special thanks to Tim Parbs for sharing this literature from the Skidmore Corporation about their heating products. Tim writes, "One of our customers has an old Skidmore ...

Published on 06/16/2014 3:20 PM
Posted in Heating Museum