Energy in buildings
Energy in buildings

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

Energy in buildings

2.4 How much insulation does a building need?

A further related question is ‘how large a heating system will it need?’ Obviously the severity of the winters at the building location is a key factor. There are two measures for this: the winter design temperature and the number of degree days.

The winter design temperature is that of the coldest weather likely to occur on the worst winter days at a particular location. It is used to size the heating system. For example the design temperature for London is –2°C, while for Berlin it is –11°C.

The number of degree days is a measure of the average external temperature over the winter months and can be used to estimate the heating fuel bills.


Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371