This is also true of heating and cooling, and I've never understood why we (in the US) build relatively dense housing communities but don't implement things lik

This is also true of heating and cooling, and I've never understood why we (in the US) build relatively dense housing communities but don't implement things like this. Having a separate air conditioner for each home, especially in a condominium/townhouse complex, has never made sense to me as it's so inefficient compared to central heating/cooling.