I need some help to eliminate the cigarette smoke in the house I have rented.

I am an owner of a small business. What I run is a small gym where women with young children and young pregnant mothers have special yoga and health awareness classes. But the house I have recently rented for that purpose had been previously used by heavy smokers. So whereever you tread you can feel this old and ugly smell of former cigarette smoke. I urgently need an air conditioning specialist who will help me get some really fresh air into my recently rented house, so that I am going to get rid of this heavily annoying cigarette smell.