Well, we have an extra space heater (the kind that looks like a radiator) in her room so its on ALL the time, so her room is the warmest in the house. Too warm for the rest of us Its when we tried using the forced air vent alone that we could see the insulation was inadequate. The times in between the furnace running you could feel the draftiness of the room, especially in icy or windy weather. So the extra space heater solution works; its just not very energy efficient to have the two heat sources going in there all the time. So when we can afford to do more spray foam we will then be able to use the house furnace, and her vent should be more than adequate to keep the room toasty. It will make a big difference in our bills.
Here is what you need, Maritsa!
A heated pad for under your rug! This was our plan for Mom's room originally. But she has some serious mess-making issues so everything in her space most be designed for constant deep cleanings. Making any area carpet out of the question (in addition to the danger that she could trip on it). But if I were you, I would get this! Heat rises so heat coming off the floor is more comfortable than anything you could imagine. You could even set it on a timer so that you could count on walking into a warm, inviting house as soon as you get home!
We were thinking of this easier solution (heated carpet) for the new room, but I like hardwood floors throughout because its easiest to clean and easy on the feet (vs. tile, i.e.). And Dh was willing to learn how to lay a heated floor under the hardwood, so that is still the plan.
P.S. The trouble I had with the nice wool oriental rug I had in my son's room is it became the cat's favorite place to sleep. So the nice deep reds and navys red would be marred with kitty's gold and white hair too often!...