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Mr. Durrani said the closer a blind or shade is installed to the window, the greater the energy efficiency it provides. Ideally, blinds should be mounted inside the window frame.

“In a smaller home, if you want to make the window look bigger, you can mount blinds on the outside of the window,” Ms. Levin said. “If you add a valance or Roman shade at the top of the window, it looks like the window goes all the way to the top of the ceiling.”

Sliding glass doors provide a particular challenge because they are drafty and offer fewer decorative options.

“One look that works with a sliding glass door is a big panel of draperies that you keep closed when you want to keep the cold air out but push to one side for an asymmetrical look,” Ms. Levin said. “For French doors, you can do drapery panels on either side of the windows.”

Ms. Carley said sliding glass doors are the least energy-efficient windows and suggests replacing them with French doors if homeowners have that option in their budget.

“One option for any window is to install a window film, which will reduce your cooling costs by 30 percent, reduce fading on furniture, hardwood flooring and carpet and rejects up to 60 percent of the heat in your home,” Ms. Willard said. “The window film is designed not to change the appearance of your home, and you can choose a film that is clear to lightly tinted that allows up to 70 percent of the visible light to come through your windows.”