<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Niko:</DIV>
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<DIV>If you have actual weather to use for calibration and you are over predicting heating energy, then I would look at the model itself...</DIV>
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<DIV>1) Are you turning off the system at night, or at least setting it back? Nighttime is when most heating occurs.</DIV>
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<DIV>2) Are you setting the thermostat profiles to correct temperatures. Is the heating T-Stat actually 68°F vs. 72°F?</DIV>
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<DIV>3) Are you modeling the correct HVAC system?</DIV>
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<DIV>4) Are your wall, window, and roof U-Values correct?</DIV>
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<DIV>5) Are you infiltrating too much air, especially at night?</DIV>
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<DIV>6) How does your electric usage (I am assuming your heating is gas) match up with utility bills?</DIV>
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<DIV>7) Is there large thermal loads like kitchen cooking, laundry hot water, or other thermal usage that should be increased in the simulation?<BR><BR>Just a few things you may wish to check?</DIV>
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<DIV>John Aulbach, PE</DIV>
<DIV>Los Angeles, CA</DIV></td></tr></table><br>