Sorry for such complicated title but the above question appears in your emails very frequently.
The TRUTH REALLY IS that the 40 W bulb´s power consumption is considerable compared to 100 W consumed by the whole refrigerator.
The TRUTH ALSO IS that such 40 W light bulb - when on - heats the inner space of the [...]

The fridges or freezers are extraordinarily reliable appliances requiring only minimum maintenance. They work 24/7/365 and with the standard maintenance recommended later in this article, the standard lifespan of a refrigerator is 12-15 years.
Maintenance and cleaning of the refrigerator condenser/evaporator
Once in every 3-4 months it is recommended to clean the condenser of the refrigerator (the [...]

1.) Buy the refrigerator with an appropriate climatic class;
2.) When installing it, choose a cool place. The fridge should not be placed too close to any heat source (fireplace, stove, owen, radiator, direct sunlight);
3.) The back of the refrigerator must be at least 80 mm far from the wall to allow the hot air ventilation [...]

You´re asking what the heck has my fridge to do with your climatic zone?
A lot of!
Climatic zones affect the power consumption of the refrigerator
The working conditions of the refrigerator in Florida or Puerto Rico and working conditions of the very same refrigerator in Canada are not the same. The temperature of the environment influences the [...]