these things, you know, it's creditablelincrementally, over , putting in a new or replacement gas furnaces expensive up front, over the life cycle cost it will be tremendously more efficient. >> what about window covers? >> curtains? curtains are good. >> what is the best type to keep the room warm? >> anything that will block out the breeze. because in san francisco, a lot of the windows are -- single pane and very breezy. if the breeze is what's bother being you, it's heavy enough to block the breeze. the products that you can look af at that are more natural products that are better for the indoor environmental quality. so i have a quick question. when you said warming the bedroom is it because feet are freezing cold? >> everything, especially feet. >> a little hot water bottle that can you fill up and stick at the bottom of your bed and then your feet aren't freezing cold and it will help warm you up. you aren't using all the energy with your fan and you don't have electricity on your body all night. we'll put that back in the energy category then. >> there seem done recently a pletho