Are air conditioners and heat pumps (including rooftops) which are fitted with an apparatus to mix the conditioned air with fresh air in the scope of the regulation?

Yes. One of the intended uses of these appliances is space cooling and or space heating for the thermal comfort of human beings as such it is in scope of the regulation.

_{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.}