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Eric Wilson's avatar

Great article! I love learning about the history of building systems. Incredible to see how much fuel switching happened in the 30 years after 1940.

One small note: I'm curious where these numbers came from: "Today over 90% of homes have some type of forced air system (either a furnace or a heat pump), with only 3% having some type of steam or hot water heat." I'm seeing 70% forced air (furnace or heat pump) and 8% hydronic in RECS 2015 and 77% forced air and 9% hydronic in AHS 2019.

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Alien On Earth's avatar

Above you write: "Between 1916 Carrier sold more than $1 million worth of air conditioning systems to..." between 1916 and what year?

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