you can never over think a grow room. its all fun and games. if you have that ac it will be cool enough by far but the room should be big enough where it wont be necessary if you have good ventilation:joint:
your plants are flowering so give it a full blast of it. the only time you would give it a little bit is when the plants are tiny and you dont want to over feed it.
yea cfls do work but i swear they are garbage. they will work fine just keep them about 1-2 inches from the top of the plant but when you get the knew light your plants will love you