Cooling Degree Days are Increasing
European Statistics recently released data showing that buildings are requiring more Cooling Degree Days (CDD) versus Heating Degree Days (HDD). This isn’t just in general but over time, between 1979 and 2021 the number of days required for cooling is increasing and the number of days demanding heat are decreasing.
This really shouldn’t come as a surprise since global warming signs are all around us. This is more data pointing out that the earth is getting warmer.
What are HDD & CDD?
Heating and Cooling Degree Days are values that Meteorologists and Energy Engineers use to estimate the amount of days will require heating and how many will require cooling. The calculation assumes that at 65ºF a building won’t need either cooling or heating. The calculation first takes the mean temperature of the day (high – low)/2, then compares it to 65ºF. If the mean is lower than 65ºF, it is subtracted from 65ºF because it is a HDD. If the mean is higher than 65ºF, it is added to 65ºF because it is a CDD.
Why is this important?
In many aspects of our lives we need to account for global warming. As an Energy Engineer, I make sure I am using the most recent weather files for my models as far as time periods and location. HVAC Manufacturers are considering the limitations of their equipment. On a scary level, we are all witness to more extreme weather conditions due to global warming. If you are looking to make a long term house purchase near the shore, are you considering rising sea levels?
How do we know Global Warming is real?
There is a lot of science and research pointing to the fact that Global Warming is a result caused by an increase in CO2 in the atmosphere. If you are looking for a few resources on some of the science behind Global Warming, NASA has some great articles that explain everything in a simple way. Here just two to start with:
How can you help?
Even science tells us that we all need to chip in to mitigate climate change! In this article, researchers say “placing people at the heart of climate action” is the only way to tackle the climate crisis. Looking towards technology advancements alone will not get us there. Looking at the Social Sciences “can help engage people and societies, and ensure a green transition that is both effective and promotes other goals such as wellbeing, equity and fairness.”.
My hope with itty bit Better, is to spread education in building science so we all understand how we can make actionable improvements within the spaces that we live and work. This is just a reminder that if we collectively make our space an itty bit Better, we’ll have a beautiful tomorrow!