Get a 3D program, build a rough stand in for the house, animate the sun and how it moves throughout the day, and render out a small raytraced animation. Then you can also play around with other props, for example, if you think that at a certain time of day there is too much sun, place a tree somewhere and see how it goes. Play around with its shape and size. Or strategically place a parasol. Or shrubs of different sizes. Or modify the shape of the pool depending on the shadow cast by the house.