I have a raised ranch with my stove in the fireplace in the bottom floor. The room gets more then warm , I'd like some of that heat to go up stairs. I leave the door in the stairway opened upstairs doesn't seem to be getting any of the heat. I'm planning on putting two floor registers on either side of the upstairs fireplace. Is this going to be enough to draw heat upstairs through the registers and draw cold air as a return down the stairway? Or will I need something more. It would be nice to know beforwe I start cutting holes in my hardwood floors.