Tag: HDD

  • Heating Degree Days Drop Again in 2017

    Prime:  prime Subtitle:  It’s not happening everywhere, but Atlanta, Aspen, and other places saw the downward trend of HDD continue Images:  We’ve had some beautiful cool weather here in Atlanta this spring. It’s about 50°F outdoors as I write this, one week into the month of May. The high yesterday was only about 70°F. We’re…

  • Heating Degree Days Drop Again in 2017

    Prime:  prime Subtitle:  It’s not happening everywhere, but Atlanta, Aspen, and other places saw the downward trend of HDD continue Images:  We’ve had some beautiful cool weather here in Atlanta this spring. It’s about 50°F outdoors as I write this, one week into the month of May. The high yesterday was only about 70°F. We’re…

  • Choosing a Base Temperature for Degree Days

    Subtitle:  This reference point is important when using degree days for energy consumption analysis Images:  Degree days are a combination of time and temperature. We looked at their uses and where they come from in Part 1 of this series, and now it’s time to go a little deeper. The temperature enters as a temperature…

  • Calculating Heating Degree Days

    Subtitle:  A lot of people know the number of HDD for their location — but where does that number come from? Images:  Let’s say you did some work on your home to make it more energy-efficient: air sealing, more attic insulation, and a duct system retrofit. You’ve got your energy bills for 12 months before…