It shouldn't. A well insulated house is going to be easier to keep cool with the air-conditioning running. It would save energy. It doesn't work just for heating in cold weather.
Unfortunately, there are many houses like that. To avoid quake damage, houses are usually built with wood or other light items. No thick concrete walls. No heavy duty heating system. They usually have small electric heater attached to walls, just enough to get by a brief chilly weather.
don't believe everything you read from FReepers. LOL
it's 30 degrees outside and 66 in my house this am when I got up with the central heat off all night(CA). Homes in CA have excellent insulation to keep our electric bills low during the summer months...