I have my farm in the garage and it get pretty hot in there, specially in the summer.
So what i was thinking is to create a enclosed room in garage or use a grow tent and cool that room and have the air flow intake of the miners air flow coming from the Air Conditioned enclosure via flexible air duct pipes?
If you ask me, using air conditioning to cool a side room instead of the garage itself might seem silly. You should think about efficiency. The goal here is to get rid of excess heat without spending much money to do it and air conditioners gobble up huge amounts of electricity, so they're not ideal for cheap cooling. Sometimes you have to think outside the box if you want to maximize profits.