HERS (or Home Energy Rating) is a measurement of energy efficiency. A typical house built in 2006 would be a HERS 100. In Boulder County, for the level of remodel that we are doing, we have to get to HERS 80. Our 1963 house is probably a HERS 150 or worse! To get a permit, we have to go to an energy rater to complete an energy model of our house. He looks at the architecture plans, number and type of windows, insulation etc to determine what our rating will be.
Since I am a geek about such things, I have actually been tracking our energy usage since we moved into the house. It will be interesting to see how the improvements affect our energy usage and how the improvements compare to the model. Comparing model output to actual output is actually part of my job as an aerospace thermal engineer.
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