Reply #6: Mostly a matter of personal taste.

[troubleinwinter]

If ya have pretty window trim, it's nice to have them inside mount.

I know I aint got pretty trim, so I prefer outside mount. I use miniblinds because I like to tilt/adjust the light... so the blinds are always pulled down, but tilted open. And outside mount makes the windows appear larger.

In general, outside mount is a bit more energy efficient, because of the deeper airspace between blind and glass.

Your windows have a pretty good depth, so if you go with inside, try to mount them flush with the front of the depth for most airspace. IF you use roller shades... even better, you can pull out the staples at the top, and "reverse roll" the shades, restaple, giving you another inch or so of air space. Sorta like changing the way the toilet paper rolls!

Good choice (energy-wise) for rooms you don't use much (or don't need to see out of all the time) are the "cellular" or "honeycomb" shades.

For miniblinds, in winter, tilt the top of the slat towards the room (heat rises and will sorta gloss over the slats & rise & stay in the room). In summer, tilt top of the slat towards the glass and the heat coming thru the window will stay somewhat trapped against the glass.