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From https://www.energy.gov/articles/history-air-conditioning https://www.energy.gov/articles/history-air-conditioning : > By the late 1960s, most new homes ha
by bgentry 4y ago
From https://www.energy.gov/articles/history-air-conditioning https://www.energy.gov/articles/history-air-conditioning :
> By the late 1960s, most new homes had central air conditioning
So the addition of central HVAC likely isn't a big factor, because most new homes in the US already had it 50 years ago.
- pixl97 4y agoEh, not 100% sure if it's a good comparison or not. Mid century homes with central hvac were typically poorly designed from my experience leading to over/under heated rooms. Modern systems typically have a much better designed return air system (hence more piping) rather than a single return at the unit.