As my name might suggest ... I'm familiar with temperatures in a few areas of the world!
Canadian thermometers (and heater controls) are in metric units. This means you're seeing 20 Celsius ... which equates to 68 F. This can seem pretty cold to someone from a warmer climate (liek southern states, or Africa, India, etc). However, it is a reasonable and, depending on who you listen to, optimal temperature to keep a home in winter.
Think about it ... water freezes solid at 0 C (32 F). If your coffee was freezing solid in the cup, the temperature might be 20 F! If it's still liquid, the temperature has to be 20 C!
The difficulty lies, as someone else has mentioned, in air circulation (both from room-to-room inside your apartment and from inside to outside through windows, etc). Several things can make life a little more comfortable for you...
- Get a good set of blinds/drapes to cover all that exposedd glass of your windows, particularly on the side the wind comes from most often. Also invest in a "do-it-yourself" sealing kit ... the stuff looks like a heavy sheet of Saran Wrap and provides an extra barrier when you fix it over the window glass area.
- Move in a small fan to direct air away from your heaters (I'm assuming you've got electric baseboard heaters ... most Canadian rental accommodations do!). This will also help move the heat away from those less-than-wonderfully-insulated walls, and bring it to where it's useful ... out in the middle of the room.
- Make sure you've got air moving from wherever your apartment thermostat is located to the other rooms ... you might get a small increase in overall heat if you focus a small fan DIRECTLY ONTO the thermostat, making it think it's slightly cooler than it really is. Keep the doors to rooms open ... allows movement and spread of heat - good thing, if all the heaters are in one area of the apartment.
- Finally ... wear a few extra layers (or simply heavier) clothing. It IS winter, you know! Most Canadians tend to wear sweaters and/or sweatshirts when around the home.
- If, after all this, you're still REALLY cold, get a small electric heater unit that you can plug in where you need it ... since you're in an apartment, I'd recommend against going for a gas heater, just from the possibility of problems.