How to get cold air from one room to another

Question

This is the very rough outline of my flat:

    +----------+
    |Bedroom   |
    W           \
+---+----------+
|Ba |Living
|lc |room
|on |
|y  |
+---+----------+

There is no window on the living room just the sliding balcony door. The only window is in the bedroom (the kitchen connecting to the living room and the bathroom are totally windowless). I could buy a portable AC unit to make at least the bedroom bearable but how could I get the air from the bedroom into the living room? Cutting a duct sized hole in the drywall is possible of course but gosh it'd be very ugly.

If I got a long enough duct extension (I found a twenty feet one), would it work with a portable AC? I could put a 14000 BTU unit in the tiny entranceway next to the bedroom door so it would cool both rooms.

I have thought of putting a water cooled air conditioner in the kitchen but a) I have no idea where to buy one in Vancouver, BC b) in light of Montreal just banning them what's the chance they are legal.

Answer 1

I have used temperature controlled fans in the past with a covers to transfer heat from the lower floor where there was a high efficiency wood stove to the upper floor. You could do the same thing in the wall using return air grates to cover the fan, the most expensive part of the project was the fancy window fan I used that both low and high temp cutouts and could vary the flow by using 1 or both fans. I don't. Remember the brand but it was expensive ~$125 for a fan but it has been in place for 14 or 15 years. I did put an outlet in the cavity so it looked like a return air vent in the downstairs and fancy brass heat registers upstairs I think it looks great and it moves the air quite Well, I think this would work in your case also.