SWIM would think that heat may result in a dirtier yield--if not an increased one--though maybe not. It's certainly worth a try.
Now that SWIM thinks about it, all of his nontoxic trials had been treated with heat after adding lime and water, but prior to adding limonene and blending (before he had decided to try it this way). It probably wouldn't make a difference unless after the blending, though, but it's something to note, just in case.