In Latvia the figure was 6%, though the data was from 2019.
The situation varied widely across the EU Member States with the largest share of people saying that they were unable to keep their home adequately warm in Bulgaria (27%), followed by Lithuania (23%), Cyprus (21%), and Portugal and Greece (both with 17%).
It's notable that many of the warmer, southern coutries of the EU seem to have more of a problem keeping warm than the colder northern countries.
In contrast, the lowest shares (around 2%) were recorded in Austria, Finland, Czechia and the Netherlands. Estonia recorded a figure of 2.7% and Poland 3.2%.