In contrast, keeping a house warmer than the outside is much cheaper. Humans with no technology are 100W heaters. All other machines that we put in a house generate heat as a waste product. With modern insulation, it's very easy to reduce the outflow of heat. Heating a house for a day can easily consume less energy than cooling it for a week.
It's very easy to keep a house cooler than the outside cheaply. You sink ducts into the ground where they get cooled to 50 degrees, and you use slow, low-power fans to move that air into your house. Sadly, we don't do this, nor do we install adequate insulation into most homes. They are overwhelmingly still insulated with fiberglass, which is practically ancient technology today.