Kathryn,
We found the constant sea breeze in CT kept our room very comfortable, no AC needed. Most windows and french doors also have a set of shutters that can be closed and locked so that you can leave the windows open all night and still maintain privacy, be safe and catch the breeze. The buildings in CT are very old and most have thick walls that keep the inside cool even when it is hot outside. Keep in mind that window screen is a rarity in Italy. If you are concerned about mosquitoes (we have never had a problem with them on our trips) take along repellant wipes.