PEX radiant sub-floor heating under basement floor

[DanS]

Do you have to be out west where the sun actually shines to get those kind of results?

I don't know if it's so much an east vs. west issue, or a low vs. high altitude issue. My parents place is at just under 7000 feet, and mine is at roughly 9000. When the sun shines, it is HOT. There's very little atmosphere between us and the sun, so I suspect that makes the solar heat much, much more effective.

Dan