Hacker News Reader

> 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.

View on HN

Eh, 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.

Reply on news.ycombinator.com