cooling my 7000w grow

Well I have been growing in a 25*13 foot space for about a year and a half now never running more than 10 600w bulbs through 10 hoods (5 on one side of the room cooled by a 8" 747 cfm fan. I redid my hood situation and now have 7 8" XXXL Magnums with a 1kw/hood. The problems is 5 of them are all inline (cooled by 1 12" vortex rated @ 1140 cfm) with each other and the other two are seperately cooled on the other side of the room by an 8" vortex fan rated @ 747 cfm. I soon plan on puttin in 2k more watts however I am noticing major heat issues compared to last summer when I was running all 600w's. SO my question essentially is as follows: I have read that 0.5 cfm of cooling is needed per watt when cooling via inline ducting so 5000w*0.5 (cfm per watt cooling rate) I need 2500 cfm. My problem is without dropping $1k on a vortex power series all I can get is a 12" 1140 cfm vortex which is still 200 cfm short and what would I end up just pushing air through my hoods as well (I've always strayed from pushing air through my hoods but I guess if both fans are rated @ the same cfm)? So say I do get the 12" and it is still 200 cfm short should I get like an inline air booster and if so do I just put that inbetween the hoods? Sorry if I seems a bit panicky with questions but my room has never been this hot and it is scaring the shit out of me.

Fans that lead out of the grow area won't cool anything -- they might redirect the hot air but nothing is done to eliminate it.

Evaporative air coolers are fairly cheap, but they raise humidity levels by cooling via evaporation. Maybe the heat of your lights can counterbalance the humidity increase from the cooler. If you buy a cheap thermo/hygrometer then you can find out.

Standard air conditioner units are more expensive (couple hundred dollars/pounds) for a suitable system but decrease humidity. There are a few on Amazon that I've been looking at myself.

I guess evaporative air coolers are good for plants in their vegetative stages, and norm air conditioners work best with flowering plants.

Hey atsamj, i have an 8 in vortex sucking air from my hoods and im pulling air through the hoods from the window. So basically i have cool air going through the hoods. I also have a booster fan starting with the hood closer to the window. Remember to have the inline fan sucking air not pushing through. Pushing through will leak the hot air out of the hoods. Also the reason i have booster fans inbetween because it moves a good amount of air without leaking air through the hoods. If u had an inline fan in between hoods it would be too strong and would leak air through the hoods. Hope this help