Old knowledge, developed through hundreds years of experience, has during a few decades been replaced by principles that are based on constant temperature and that the energy needed always is proportional to the temperature difference outside - inside. In a calculation of steady state condition the rise of the temperature would be 135 degree Celsius. It would be very difficult for a person to survive longer than minutes. Common sense and experiences must tell us that this is not happening. But we are still dimensioning the HVAC system and controls for this case.
Passive technology is the next step in saving energy in buildings.
The thermal mass of the building structure is utilized to even out indoor temperature fluctuations and move excess energy from day to night, from one day to the next or from periods of warm weather to colder ones. It is an old joke about military commands and command structure. This joke fits even better on the common practices for design, dimensioning and control policies within the construction industry. The positive thing is the large gains that can be done, without replacing the constructions with new ones. It is a lot of possibilities for fast and efficient fixes.