Not really unless you keep your plants very small. CFLs are great for starting seeds or vegging small clones. Once your plants get to a certain point with cfls you end up with a lot of space in between the nodes which can seriously diminish potential yield later on.
A T5 fixture will distribute the light in a wider space but conventional bulbs do not penetrate a thick canopy very well so again you can end up with lanky plants unless they are kept low. Cool thing about T5s us you can upgrade the bulbs. Check out the hortiluxe power veg and/or agromax full spectrum T5 bulbs; I run them in my bloom room for finishing plants under a UV spectrum.
Small LED panels are actually pretty good for vegging small plants compared to cfls but they also have a somewhat limited amount of penetration. Of course high end LEDs will do the job if you can afford them.
A 400w mh IMO is the standard for vegging plants with nice tight nodes. When your plants develop nice lateral branching the buds eventually touch each other and form continuous spires of bud during flowering. Donkey dick colas abound....
I have similar heat issues with my own 600w hps but I think you need at least this amount of wattage to push nice big flowers. I can never grow weed as dank in summer as I can during winter due mostly to higher temps. Options are to add an a/c or upgrade your ducted inline exhaust fan to pull out the extra heat but I realize this also means higher electricity bills.