Hire a technician to install screens in the windows of your summer porch. Depending on your preferences, remove the glass windows and replace them entirely with screens or add screens to the existing windows.
Install a ceiling fan to keep the air in the porch circulating. Hire an electrician to run power to the ceiling for the fan.
Set up misters around the porch to spray a fine mist of cool water to lower the temperature of the air. Misters are available for every budget, from small, battery-powered single units to large, pipe-fed systems that run off your home's electricity.
Attach blinds to the sides or windows of the summer porch to provide shade when the sun is striking the porch area directly. Blinds, which often are called "sun shades" in porch applications, are available at stores that sell porch accessories and are manufactured in a variety of colors and styles.