I own a cabin in the mountains. 2br, 1ba. the house heater is a simple floor heater/furnace in the living room. it's pretty big and really does a great job to heat up the living room. However, the rooms remain cold. Is there any way to adapt the floor heater to send heat to the rooms? ie: can i make a hole and route some kind of vents under the floor? the house has crawl space.

you can see the photo of the floor furnace.