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What does "Yesterday's Heating Degree Days" mean?

Think about it as Degree x Days the way we measure a crew's work in man x hours...

It doesn't mean anything in the natural world. It's just an arbitrary way to standardize the count of how much heating you should have done during a day (or month, season, etc.)

Assumes a couple things: first that 65° is the temperature you'd keep your thermostat at and that (Low + High)/2 correctly represents the average temperature.
 
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