Didn't we do that? Isn't that what led to the leaky condo problems?
I'm thinking just more insulation in the attic and walls, and higher standards for windows, or a combination of all that.
There is an interesting and relatively easy-to-calculate insulation standard used in some jurisdictions. The take the surface area of all the exterior walls, and the footprint of the attic (the plan of the foundation) and they insist on a minimum average R-value for the lot. So a builders can achieve the goal by using less windows (windows are not good insulators) or increasing attic and/or wall R-values. Yes, in some cases this will require additional wall thickness. Sometimes they can get extra credit by using an insulating garage door, or by having a detached garage, or by having a double-door system from the home to the garage, or even by having a single-car garage rather than double or triple. They can get extra credit by using a heat-pump or geo-thermal etc.
It's not all that confusing a system, if you are in the building trade.