Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Heating Museum Help Topics
Take a stroll through HVAC history in our Heating Museum. This section of our website preserves history and answers that so-important question: What the heck is that thing? Whenever you run across anything unusual, chances are you’ll find the old literature about it right here.
Heating Museum Categories
Asbestos
Boiler Explosions
Boilers - 1959 to 1980s
Boilers Prior to 1959
Coal Heat
Controls
District Heating
Green
Greenhouse Heat
Heating History
Homeowners
Oil Heat
Old Ads & Magazines
Old Hot Water
Old Radiant
Old Steam
Radiators
Stories from Heating History
Textbooks
Thermostats
Very Old Stuff
Warm-Air Systems
Water Heaters
Recent Articles in Heating Museum
The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
This chapter on hot water heating systems and piping was prepared by Professor F.E. Giesecke (Director of Texas Engineering Experiment Station in TX) for the The American...
Jarecki Radiators (1890)
Here are ratings for the Erie radiator from Jarecki Mfg Co Ltd. They were based in Erie, PA and their radiators appeared in issues of Domestic Engineering in the 1890s.
A History of the Radiator
Brian Roberts & Paul Yunnie compiled this document that contains beautiful vintage advertisements and illustrations of radiators from the mid to late 1800s and early 1900...
The Story of Herman Nelson, Founder of the Moline Heating System
This document contains the story of Herman W. Nelson, founder of the Herman Nelson Corporation and the Moline Heating System (a vacuum-vapor heating system).
Catalog of Bundy Radiatiors from A. A. Griffing Iron Co. (1890)
Click here to view a beautifully illustrated catalog of circa-1890 Bundy radiators from the A.A. Griffing Iron Co.
Benoist Bros. Furnaces Catalog
This catalog from Benoist Brothers of Mount Vernon, IL, showcases their furnaces, circulators, tank heaters, and laundry stoves.
Why Congress Has No Windows
People who knew Capt. Montgomery C. Meigs said he was occasionally pompous, but when the job was done to his satisfaction, he said, “This was the most difficult piece of ...
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...
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...