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Tell me if the copper refrigerant lines were ever cut, and if because of that or for some other reason, the system was recharged with refrigerant.
If it was, it is likely that few too many ounces of refrigerant were put in the system, that allow the system to provide heating and cooling, but can increase your electric bill 30 to 50%.
That will be our best starting point... Let me know about that, we can go from there.
Hello again, you will not be able to tell by looking, you would know by your personal observations only...
So far it sounds like someone may have mixed the wrong type of refrigerant in, or added too much refrigerant. To diagnose that you need a set of refrigeration service gauges, that is something beyond most home owner capabilities.
If you can tell me which direction you are from the center of the nearest city, I can look for any well rated outfits in your area and give you a short list of them.
We can go from there without a time limit.