Comparing 13- SHEER with 19-SHEER . Heat pump unit

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Hi, 

I am comparing 13-sheer (11.18 EER, 2.25 COP)  with 19-sheer (14.06 EER, 2.63 COP) Residential type heat pump unit,  All other parameter (Envelop, Glass, Lighting) are same. 

ECB show only 10 % saving in Energy wise and 6 % saving in Cost wise. 

I feel that its too low. 

Is there any idea how much we expect with this comparison. Any suggestion will be Appreciated. 

Thank you 

Anil Bhari 

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