heat problems

i have a 3m 1.5m 2m grow tent with 2 hps lights [400 watt] and 9 plants. i have 2 small exhaust fans taking hot air out and 1 bringing cool air in. i also have 3 oscillating fans circulating the air.recently the temp outside has got hotter and this has made my grow room temps reach 94 degrees the temp normally is 81 degrees. which has stumped and slowed the growth what is the best way to get my plants healthy again. my plants have 4 weeks to go. thanks in advance.

I have a friend that just had the same problem, all his got heat stress and some leaves turned yellow. there will be a slight stunt in growth and it is ideal to have a 79-81 degree grow room. idk if 400 watts is enough because my friends has 3400 watts for 8 plants and his are metal halide lamps. so you should try to put more lighting in and keep the temp in that range