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Thermal study of a single-family home

Hello, I am impressed by the in-depth discussions on this forum. I would like to take my first steps with OpenStudio, as I am facing a problem that is probably quite simple for most people here, but not for me.

Here it is. It's a single-family home consisting of, from bottom to top: a basement (which is half the size of the house, lengthwise), a living space on the ground floor, another living space on the first floor, and an attic.

What I'm trying to figure out is which living space has the “thermal advantage.”

The ground floor apartment has a cold floor because it is in direct contact with the basement. When it is heated, and it is not too hot outside, it emits heat through its six sides, and also towards the first floor apartment.

The first-floor apartment has a heated floor (due to heat loss from the ground-floor apartment), but it loses heat through the walls and ceiling to the attic.

The basement and attic are not heated. The attic experiences greater temperature variations than the basement.

Can this question be simulated in OpenStudio? If so, what are the first steps to take? I have drawings of the whole building in SketchUp.

I would be very happy to benefit from the experience of the participants in this forum, and I thank them in advance.