The decision would depend on the job that needs to be done.
Basically, there are four levels of repair from the cost perspective. Let's start with the worst case scenario:
1. Compressor needs replacement.
This is the most expensive repair. You are looking to pay CAD 1,000 - 2,000. Almost everyone just buys a new refrigerator at this point;
2. Major (other than compressor) component needs to be replaced such as a control board or air dumper assembly. The cost for those kind of repairs would be
CAD 400 - 600.
3. Minor (not that expensive) component needs to be replaced, like - defrosting timer, defrosting thermostat, defrosting heater, evaporator fan, condenser fan, water filter housing... price: CAD 250 - 400. And, the last case scenario:
4. No component needs to be replaced. The most common type of this kind of repair is water leak: There is a formation of ice underneath the evaporator preventing the water to go down the tube into the drip pane. This job is simple but could be time consuming - depends on the size of the ice build-up. Price: CAD 180 - 250.