U-Value: 0.97 W/m^{2}°K

The area of the wall is: 17.9 m^{2}

The calculated degree hours are: 37,440 °K h

Using the units for U-Value W/m^{2} °K

m^{2} and °K cancel.

Product of the above figures.

0.97 x 17.9 x 37,440 = 650,071 Wh

@ 8p/kWh 650 kWh per annum

£52 / year heating cost