In countries with a high percentage of homes having air conditioning, those that do not have AC are often in cool coastal or mountain areas. Consequently, we would not expect to see 100% of homes having AC. In the U.S. 98% of all newly constructed homes have AC, typically as part of a central HVAC system.
France (this is from an official government account) plans to solve the heat deaths problems in 100-200 years after the word spends hundreds of trillions of dollars to lower average temperatures by a fraction of a degree:
