Yes, keep it all real cold; that helps to infuse the good stuff into the EC. Once I evaporated the EC in a cold bathroom with a fan and an open window to release the EC fumes. The more you heat it, you start to lose good stuff, so do it on a real low temp if you use heat, and make sure that you're letting the EC fumes escape, cuz they can explode. You should have read first, she fussed.