CFL is one of the least efficient lights, its like 60lumens per watt.
They do create heat, you just don't notice it because your not using much wattage.
But to grow 4 plants you would need a fair chunk of wattage and that heat will be noticeable , the big difference would be if using 400w of cfl you would get 24'000 lumens, where with a 400w hps 48'000 lumens so for the same power you get the same heat but with the HPS you get twice the light.
If you use good LED strips you can get 180-200lumens per watt and do the same thing as 400w of cfl with 135w of Samsung strips making the whole thing far cooler.
Obviously the OP cant afford to build an LED fixture on $40 but they should be able to pick up a 400w HPS second hand for around that.
I don't doubt CFL grows weed, I actually like the structure a 5000k bulb creates but for anything other than a micro grow its a waste of power and even in a micro grow there are far better options these days.