Heat Problem!!!

Right now im using 2 36" fluoros

but Im getting close to fowering which im going to use a 400W HPS
Last time i put my HPS in the temp went up to 45 degrees

If i use a bathroom fan would it suck enough hot air out and keep it at a good temp?

i did the same thing and AI am using a regular AC window unit to cool my room, if you let the fan run 24 hours it might work fine depending on the temp. outside.

I had the same issue, I connected two bathroom fans, but the heat outside didn't help my situation. In the end I purchased 4 inch inline fan and some insulated ducting. It made a big improvement. I also froze 2lt bottles of water every night, I placed the bottles in front of my oscillating fan during max temp eaxh day, it helped a little.the cool tube is the way to go. The bathroom fans were very noisy in my situation.