Which Sherlock Holmes foe couldn't stand the summer heat in London and stole every air conditioner that he could lay hands on?
It was, of course, More-air-iarty.
While we're at it, which Sherlock Holmes foe led his victims down dark alleys to their deaths with the promise of low prices?
That was K-Mart-iarty. Of course, he mostly operated in the Blue Light district of London...
I'll just go quietly now...