Dehumidifiers are excluded from the scope of Regulation (EU) 626/2011 on the energy label of air conditioners and from the scope of Ecodesign Regulation (EU) 206/2012 for air conditioners and comfort fans, and are not covered by other Energy Labelling regulations: the EU has not defined energy rating for dehumidifiers.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.