Heating Degree Days – and Why October’s Numbers Matter
When we talk about how cold a month gets, one useful measure is heating degree days (HDDs). An HDD shows how much the average outdoor temperature fell below a base value – typically 65 °F in the U.S. The colder the temperature, the higher the HDDs. The more HDDs there are, the more heating (and… Continue reading Heating Degree Days – and Why October’s Numbers Matter