An infared image showing the effectiveness of a chimney sheep in preventing heat loss

Hot Chimney, Cold Chimney

On the 15th January 2013 it was -13°C. On the 15th January 2014 it was plus 13°C. 26 degrees difference! Bulbs are growing, birds are singing…is that the end of the winter? But even in these mild temperatures, heat is shooting up chimneys across the country. Have you tried the stack effect calculator? With a …