Will wooden doors crack or shrink during the Russian heating season?

Central heating can drop indoor humidity below 25%, and timber dried below its equilibrium moisture content will shrink and may split along the grain. We control this by kiln-drying to a target moisture content suited to heated interiors, using LVL or cross-banded cores that resist movement, and sealing all six faces. Keeping indoor RH around 40–55% in winter further reduces the risk.