When choosing a new air conditioner for installation in your home, efficiency is one of the most important factors you should consider. Units with higher efficiency are typically more expensive to purchase, but the cost of operating these air conditioners can be much less because they use energy more efficiently. Opting for a lower efficiency unit due to a lower purchase price can end up being more expensive overall. Efficiency affects initial installation costs and long-term operating costs, so utilize efficiency ratings to help you determine which York air conditioner will be the best investment in the long run.