Heat Pumps and Electric Heating - How many vents in 300sq foot room

300sq foot bedroom in the basement, how many air vents would you recommend? I currently have one air vent and one return air in the same room.

Whats the heat loss on the room there??????

The window is the only known source of heat loss, although its insulated all around, with weatherstrip, and fully finished around. The ceiling is insulated with R-20(mainly for noise) and the walls are insulated with R-12 all around. I don't find it too bad at all, but the girlfriend finds it chilly. A bit of a change from a crammed 100sq foot room in an upstairs level. Fortunately, the furnace is right next to the room so I can always add on if I need to...

You say you have one register now. So Id add one more . a 6" run to about 12" off the outside wall with a 2 1/4"X 12" register blowing down by the window. This way the air has to go across the room to the return. ;)

I'm a bit limited as to where I can put the register as the ceiling is drywalled. I can only run it on one of the walls opposite to the side of the window. :) The register that is in there right now is about 3 feet away from the window in the ceiling. The return air duct is also in the ceiling so I don't know what barring this has.

Another thing you have to consider is the running time of the furnace and the heat loss of the room.
It is a good idea to distribute the air as Ed has suggested but if you have temperature swings as the furnace cycles you may still find it uncomfortable.
Your climate is the same as ours and unless you have really good insulation you may find a supplental electric baseboard heater would be the best thing to stabilize the temperature.
We have one in ours.

As well, humidity plays a big part in cold climates. If you get a digital hygrometer/thermometer you may get a clearer picture of why you are uncomfortable.

The return air duct is also in the ceiling .

It could help if you could get that return down near the floor.

double post

The only reason I put it in the ceiling was because the main return air duct for the house runs right through the bedroom, it was the easiest way to tap into it with a T splitter. The only thing I didnt put much thought into was HVAC when I built the room but I do have to admit it is easier to breathe in here and after only a week sleeping in the room I feel so much better in the mornings compared to our old room. Might not be perfect but I think I did something right. :D