The old Chevy Sparks are basically golf carts with 4 doors and permission to drive in the roads. They are the least “techy” EVs I’ve seen in person as they are really just a battery swap with the minimally-appointed ICE version of the car, which is very sparse on the electronic doodads.

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Yes, they certainly have to meet requirements for air exchange. And if you define “airtightness” as that, then yes, the ones that met that definition met that definition. What they are not is the common definition of airtightness, as in a sealed glass jar, steel can, scuba tank, or submarine, which if you look at the comments here was what was confusing a lot of people. I don’t think anyone was contending that there aren’t tests that these houses have to pass, just that the word airtightness, as understood by laypeople, isn’t an accurate term to describe these homes.

They aren’t “airtight”, that would awful. They are well-insulated and designed to take advantage of passive solar heating and air exchange cooling. The way roofs and windows and orientation on the land is usually done for western homes is just terribly inefficient for capturing and releasing heat in the right ways. Just some thick walls, a bank of windows facing the sunrise ,and some proper roof vents that can be opened when it’s hot is all most passive houses really are.

Is boiling the tap water just like superstition or what? or is it really not treated/cleaned by the local water authority to be fit for human consumption? Just curious what people think the benefit is, because in the US and Europe from what I know, we treat our public water so that it can, you know, be used by the public safely?