The above charts show average temperatures for Derry and London.
Derry has 4 months with average temperatures above 16°C and 4 months with average temperatures below 9°C.
London has 6 months with average temperatures above 16°C and 3 months with average temperatures above 9°C.
Derry has a heating season of 8 months compared to 6 months for London.
Derry has 4 months with average temperatures above 16°C and 4 months with average temperatures below 9°C.
London has 6 months with average temperatures above 16°C and 3 months with average temperatures above 9°C.
Derry has a heating season of 8 months compared to 6 months for London.
The above charts show average wind speeds for Derry and London.
Derry has average wind speeds between 6 and 4m/s. London has average wind speeds between 4 and 3m/s.
Derry has average wind speeds up to 50% higher than London.
Research shows that a windtight wall subject to wind speeds above 2.5m/s will suffer a 10% drop in thermal performance.
However a non-windtight wall, with cracks and gaps, will suffer a drop in thermal performance of 40%.
Derry is subject to a longer heating season and higher wind speeds than the UK average therefore the £50 cost for each basketball size for gaps and cracks will be alot higher.
Derry has average wind speeds between 6 and 4m/s. London has average wind speeds between 4 and 3m/s.
Derry has average wind speeds up to 50% higher than London.
Research shows that a windtight wall subject to wind speeds above 2.5m/s will suffer a 10% drop in thermal performance.
However a non-windtight wall, with cracks and gaps, will suffer a drop in thermal performance of 40%.
Derry is subject to a longer heating season and higher wind speeds than the UK average therefore the £50 cost for each basketball size for gaps and cracks will be alot higher.