new to green house growing? help.....

so i have a bunch of plants in a greenhouse right now in week 3 of flower and and am throwing about ten to 15 chem dawg in there after they veg for two weeks any advice, precautionary measures etc..... p.s. this is in socal so one day could be hot and the next could be cold....

Water storge and lots of it water well keep your green house cool on a hott day and warm on a cool day also check out solar powerd attic fans they can move up to 1000cfm and are only like 200 bones

This should work well just don't try to veg outdoors this time of year and make sure you keep your humidity/moisture levels in
check.

for sure thanks guys