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It is how degree days were originally defined and it correlates better with the heating/cooling energy consumption of modern thermostatically-controlled HVAC systems (which vary their output as the temperature changes throughout each day). The Integration Method accurately accounts for temperature variations within each day as well as temperature variations from one day to the next. It's an intensive calculation process, but it's the best method we know of for accuracy of the resulting degree-day data. We call it the "Integration Method" because, mathematically, integration is how it works. We calculate degree days from detailed temperature readings taken throughout each day, using the Integration Method that is introduced in this introduction to degree days and explained in more detail further down on this page.
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But you might find our answers to these calculation-related questions useful if you're curious, or deciding whether to get your degree days from here or another source, or if you're comparing data from our system with data from elsewhere. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail – just use Degree to calculate the degree days for you. This page explains how Degree calculates degree days.