Yes, Willtill, but the effect is diminished. As a subjective measure--With the stock grips, I only had to turn the heat on high for 5-10 minutes before they were way too hot for me and I turned them down two or three clicks. With the shingrips on, they stay on full blast and still only feel somewhat warm. They've gone from easily keeping my hands toasty warm, to kind-of fending off the cold. It's an unfortunate trade-off. However, I'm willing to accept it because of the surprising increase in ride comfort.
Jason