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I have seen some DOE reports with data that would suggesxt that the new high SEER( over 16) units do suffer a larger drop off in actual cooling due to the undersized compressors they must use to get that high rating at the 82F SEER test.

Since I live in a place where almost the entire summer is 100F plus this is relevant to me.

So if I have an older SEER 10 or 12 unit will it cool better at 100F than a newer SER 16 to 18 at the same 100F?
 

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It is essential to understand why the local weather environment dictates what SEER level air conditioning equipment you should choose.!
 

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So if I have an older SEER 10 or 12 unit will it cool better at 100F than a newer SER 16 to 18 at the same 100F?
Not really. R410A does have much capacity/efficiency loss, until condensing temp reaches 135F.
 
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