Curtains are lovely, perfect in in my beach condo!!  I used 4- 54w by 95l panels on sliding glass door and 2 in the dining room   They effectively filter out quite a bit of sun light.  It's only been a few days but I can tell that it helps reflect the sun which aids in controlling the temperature.  I'm transitioning from heavy black out curtains so I do feel a slight increase in room temperature.