My Danish grandmother's g eneration were brought up to house-clean thoroughly both in the spring and in the autumn, when you stopped needing heating on, and before you started.
That generation had two sets of curains - winter ones and summer ones, so part of the twice yearly cleaning consisted of taking down the curtains, washing them and putting them away, cleaning paintwork and window-panes then hanging up the correct curtains for the time of year.
Summer clothes were washed and put away in the autumn, winter ones in the spring.
I clean my kitchen cupboards in October, clean the rest of the house well before Christmas again before Easter and change summer and winter clothes around at the appropriate season.
All year round I clean rooms on a two week system, wash and iron clothes weekly and tidy up as we go along.
Paintwork and windows still go by the old spring and autumn routine.