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There are many things you can do to improve your efficiency in this type of invorment. The thing is the ma and pop store think they can't afford it. Plus most won't spend the money because they don't see the benifit. The ashere show gives you Ideals every year. If the equipment is kept up properly it can last a long time but if not it will need to be replaced between 10 and 20 years. Then you have some types of produce that eats the coils away. Next, if you want to recover some of you energy you can us heat reclaim or other types of systems that can provide energy savings by not having to defrost your coils. I know a few but most people don't want to invest the time or money.