Costs vary by region: Ha Ni housing is lower cost than for equivalent in TP HCM. Since you won't be here for a year, it's unlikely your own name.
So your housing will be either sharing or a room. (Depending on sharing arrangements there will be water, hydro and cooking gas on top). A room, not shared, are priced all in - landlords can't charge extra for electricity.
Air-con is not necessary, usually, at that time.
Note: There are definite temperature differences between north and south. The south will be like a YVR summer whereas Ha Noi will be down to as much as O C (freezing) - a Vancouver winter without the snow.
In city travel can be by rudimentary transit (bus) or rent-a-driver taxi to regular taxi.
Food, again, depends on your accommodation (cooking facilities or not) but even eating reasonable meals out at restaurants (not high end) should cost CAD%5-7.50 tops.
Intercity transportation - frequently called Open Tour - is around CAD30-40, depending upon season, TP HCM >> TP Ha Noi. Use Mai Linh Express or Huang Long for safety, the rest aren't safe for even carting livestock.
Electricity is 220VAC (adapters/transformers available at low cost here), water only in SaiGon is drinkable (bottled most everywhere else especially Ha Noi where there is heavy natural arsenic in it).
Budgeting CAD$1,500/month should be fine, CAD$2,000 allows for life's essential extras like beer, etc.
Don't bring (much) cash AND only cash in about $40 at the airport cash desk on arrival. Make sure your bank knows where you are so you can use your credit card without hassle over here. ATM's are like mushrooms here, use the ones with security guards at night.
With three months you can easily do the tourist run: SaiGon >> Da Lat >> Nha Trang >> Da Nang/Hoi An >> Hue >> Ha Noi >> Ha Long Bay >> Sa Pa. It is worth doing as you have the time and there are distinct differences to various regions of VietNam.
Get your air ticket from a travel agent, either in the Chinese or Vietnamese areas of Vancouver, as they get consolidator prices. Pre-Christmas increases apply here. Eva Air and Cathay are the better carriers, Air Crap and US carriers should be avoided (anything through the US is a bummer because of what they call security). Carriers frequently transit through HongKong (Cathay) or TaiPei (TaiPei) and most allow a stop-over on the return journey without additional cost.
Basically. living here is just like on Fraser and Nanaimo Streets in Vancouver.