The average lifespan of an air conditioner is about 15 years. However, this can vary depending on the type of air conditioner, as well as the climate in which it is used. British Columbia has a relatively mild climate, which means that air conditioners may last a bit longer in this province than they would in other parts of the country. Additionally, proper maintenance and care can help extend the life of an air conditioner. With proper care and maintenance, some air conditioners may last 20 years or more.