Good question! The room is northeasterly facing so the sun exposure is limited. All glass is high performance dual paned. The glass at the ridge opens to let the heat rise right out of the room. On the blistering hot days, the owner will turn on the AC system for that particular zone in their home.

Is this the same stone as on exterior? What is the name/color of this gorgeous stone? Thanks!

The vertical stone around the fireplace is the same as the exterior stone although I can't recall the name. If you take the picture to a local building material yard that sells stone in bulk to the construction industry (not Home Depot, Lowes, etc.), they should be able to tell you.

I've heard argon windows can help?

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