yes it will work. the heat is only used to speed up the process. they sell 90 somthing% right next to the 70 in my wallmart. Make sure you use somthing that is easy to scrape like a glass dish that is large enough to fit a stright razor in or it will be difficult to obtain the resulting oil. Just leave it in an open area and wait. you can use a fan to help the process along as well.