The right window treatments will add:

-Light control: protect against UV damage on artwork, hardwood flooring, and furniture; allow you to better see your screens (TV/computers); maintain your view- so you can still out the window but block the sun

-Thermal control: reduce utility bills in the summer and winter by blocking the sun's heat or blocking the warm air inside from escaping

-Privacy: Nobody wants to live in a fishbowl

-Style: whether you like classic draperies or lean towards industrial chic window treatments can dramatically change a room.