There was a Song Festival in Latvia, where the closing concert was called "Latvia - the Land of the Sun". In Latvia, the sun shines more than, for example, in Denmark, which ranks 5th in terms of the area of solar collectors per capita in Europe.
Already now in Latvia it is possible to use solar collectors for basic heating, fully supplying the house with heat and hot water from solar energy. This type is called a "solar heat pump system". The average efficiency for such a system is 8.