Before leaving for work or running errands, open all the windows and shutters to allow cool air to enter and hot air to leave. Normally, between 4 – 8 a.m. we have the coolest morning hours.
Remember, hot air rises, open your top-level windows.
Just before leaving, close all shutters, especially windows that are getting direct sunlight. This process can create your own personal A/C without increasing energy consumption.