Stop hot pockets from forming with air circulator fans. You can even point them at ballasts, chillers or anything else that emits heat.
Prevent plants losing too much water - increase your humidity as temperatures climb.
Always use Silver Bullet Roots, just in case your nutrient temperature does spike. A small dose of this'll prevent Pythium - it kills 99.99% of bacteria, mould & fungus!
Nutrient (harden plants to heat stress)
SHOGUN Base Nutrients: contain SmartZen - an exclusive additive that helps plants cope with heat stress by reducing the rate of transpiration. It also increases chlorophyll content & photosynthesis so plants are more robust.
VitaLink Chill: is another great shout. You use it throughout your grow to build levels of key nutrients needed to tolerate higher levels of heat
Biobizz Leaf Coat: coats plant leaves in a biodegradable latex layer which helps prevent over-transpiration when your temperature climbs.
Help keep the bugs out with a few accessories.
Add CO2 to ensure photosynthesis can continue at a really high rate. This'll increase growth and help plants cope with high heats of up to 29oC - 30oC. The best bit is that high temperatures actually improve CO2 absorption - it's a win all round.