Raise temperature to 78
When it's hotter you can raise the temp to 78 and the ac will work better imo. 74 is way too cool and the electric company will tell you that's why blackouts occur. Set it higher and go to a rec center if possible for a few hours. Your electric bill will thank you also!
Also older ac units are not as efficient as new models. When we replaced our 15 yo unit the house cooled better and our bills were less because the new technology was so much better.
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