You do know that most public holidays are based on christian events right? Spacing those out is only possible if we separate those days from religion.
The statuary minimum holiday entitlement of 20 days (most employers give 25+) can be used freely.
FYI: King’s day is celebrated on the king’s birthday. Not on some randomly selected day.
We’ve got a ground source heat pump with underfloor heating and cooling since two years. It’s always a comfortable 19-22 degrees Celsius inside (66-72 Fahrenheit) and we’d never want anything else.