I have tried 5 CFLs with my plants, changed to 4 CFLs because they were too hot, now I have an HPS on.
the temps don't even compare, those 4 CFLS were bringing temps to ~95ish. the HPS keeps the room 85ish when on, but my HPS has a glass window over it.
Keep in mind dude you have to put CFLs closer to your plants, like inches from it, in order to get the amount of lumens a HID light can put out being a foot away.
PS a 250 Watt CFL has to put out heat. Maybe not in the bulb, but definetly in the ballast, all that 250 watts of power has to go somewhere.