It could be that it is not large enough to get 74 in yesterday's heat. Since 77 was fine why not use 77?
Up North (runs in the summer) my A/C ran about 15 years. I think at 15 you are getting to the end of its life. Assuming your new A/C will run for 15 years why not get it now instead of in a year or two after it breaks down. My assumption is you will buy a new A/C one more time in your life. So why not now?
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