It's essential to avoid overheating during the summer. If you are having your HVAC serviced or repaired, you have a few options to stay frosty. Of course, staying home with the AC on during the hottest part of the day is preferable. San Diego's beaches provide a great way to cool down on hot days, and there are freshwater splash fountains at the free Waterfront Park downtown. Go museum-hopping in Balboa Park - Fleet Science Center, Museum of Man and other park facilities have air conditioning.