even if ...,...cannot

not ... at all

air conditioning

very, exceedingly, awfully / (before a negative form) not at all, at all, by no means

efficiency

room (of a house or hotel), chamber, apartment, flat / (sumo) a stable where rikishi live and train together under a shisho oyakata (stable master)

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

optimization

to optimize