Quote:
Originally Posted by Dr.Butler
Hi all. So central AC is essentially a foreign concept to me. My unit is 15 years old but seems to be working fine, and I am of the mindset that if it is not broken..... BUT I notice that for example yesterday, I set the unit to 74 degrees. During the heat, it went up to 77 degrees. The house felt fine, but it seemed like the unit was not keeping up? By the evening it went back to 74. I recently had the unit inspected and topped off with the coolant. So I guess the question, is this essentially normal/expected behavior?
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If the refrigerant was low, you probably have a slow leak. I agree with other posters that you should consider buying a new system. I would also evaluate the size of your current system to make sure it is not undersized. You may need to upgrade to a larger size unit. It may help to compare the size of your unit with other similar size houses in your neighborhood. Typically, you need at least one ton of cooling for every 600 square feet of living space. If you don't know the unit size, write down the model number on the outside unit and look it up on the manufacturer's website. Good luck.