Hi Oscar, Your model may have some other flaw(s) that allows for the high savings. Or the 40% could be the normal condition (I just achieved 33% against a very difficult baseline). In addition, a COP of 4 is not that great (mine has a heating COP of 5.2 and cooling EER of 14.4). Hope that's helpful, Dan Briller RS&H Daniel L. "Dan" Briller P.E., LEED AP BD+C Energy/Environmental Engineer 10748 Deerwood Park Boulevard South Jacksonville, FL 32256-0597 Phone: 800-741-2014 x2329 / Mobile: 571-314-4002 mailto:Dan.Briller at rsandh.com Visit our website at http://www.rsandh.com Connect with RS&H on https://www.facebook.com/WeAreRSandH https://twitter.com/wearersandh http://www.linkedin.com/company/rs%26h -----Original Message-----