well.. i tried an alcohol extraction and i hardly got anything out of it. i'm pretty sure i did it right. either way at the end the weed/plant matter was useless and the "hash oil" i was left with was barely any. so i guess i got the majority of it out using the no-heat extraction but i find that hard to believe. i conclude:

no-heat extraction works but leave it for more time then i did. also, if you can, a heat extraction always works much better.
I'll make again in a week or so with heat and the same amount of the same quality bud and will compare the brownie's highs. that will be a better qualitative analysis.