A cooling degree day measures how warm it was relative to a baseline temperature in a 24-hour period. The higher the number, the more likely the air conditioner is operating. Other factors such as humidity and individual preferences also play a role. Tracking cooling degree days can help with budgeting for energy bills.
A cold degree day (CDD), also known as a cold degree day, is a formula that measures how warm it was relative to a baseline temperature in a 24-hour period. The higher the cooling degree day measurement number, the more likely the air conditioner is operating. Similar in concept is that of heating degree days. The main difference, of course, is that with heating degree days, the oven is the device that should run the longest.
The way to find out the cooling degree day number is to use the high temperature and add it to the low temperature for the day in question. that number is then divided by two. For example, if one day the high is 90 degrees Fahrenheit (32 degrees Celsius) and the low is 65 degrees Fahrenheit (18 degrees Celsius), the average temperature would be 77.5 degrees Fahrenheit (25 degrees Celsius). This average Fahrenheit temperature would then be subtracted from 65 Fahrenheit (18 degrees Celsius). While it is possible to calculate a degree day of cooling from any temperature, this has been chosen as the comfortable means. The result would be 12.5 degrees cooler for that particular day.
However, there are other conditions that can make an air conditioner work harder on certain days. It is impossible to say for sure what the cooling degree day measurement might mean without noting these other circumstances. Factors such as the heat index, which includes not only temperature but also humidity, how long the furnace has run, whether the thermostat is programmable, and a household’s individual preference for a certain temperature all play a role. The important thing to remember is that a cooling degree figure is only a guideline to help plan energy usage.
However, for those who have been in a home for some time and are familiar with air conditioning units, a number of cooling degrees per day can provide a baseline figure for forecasting energy use. This is especially true for those families whose habits or situations remain stable during most of the warmer months. While you can do this simply by looking at high and low temperatures, this formula provides an easy baseline and is simple enough to remember.
This can be especially important for people who want to make sure they’re budgeting enough money each month for next month’s energy bill. Many times, bills can fluctuate wildly during the warmer months as some months will be hotter than others. Tracking cooling degree days should help those who want a more accurate measure of what they’ll be up against.
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