St Julian’s Church was built in the 1950s, well before energy saving measures such as double glazing and loft insulation were introduced. Since then they have further improved the energy efficiency of buildings with roof insulation and new boilers and radiators.
The entrance area and kitchen are recently built to modern standards.
The Sustainable St Albans thermal imaging camera was used to find out where the heat was escaping.
What they wanted to know:
- Do the new curtains and blinds help?
- Is the roof well insulated?
- What needs fixing?
What and when?
- February 2019
- Photos were taken in the late afternoon
- The whole building had been in use and heated all day
Understanding the pictures: The temperature shown at the top of each picture is that at the centre of the cross hairs. The scale on the right hand side gives the temperature range.
From looking at figures 1 and 2, it is clear to see that there is a significant reduction in heat loss when the blinds are closed.
The two images below (figure 3 and 4), demonstrate that closing curtains or blinds can have a similar effect to double glazing.
The dark blue roof shown in Figure 5 indicates that the roof of the church is very well insulated.
Improvements that have been made in light of findings:
Partly as a result of using the Sustainable St Albans thermal imaging camera, St Julian’s has installed replacement curtains in their hall, as well as new blinds in the church.
Andy Sharp said in his article for The Parish Magazine in May 2019:
“I’ve looked at the gas bills – and we only use gas for heating. Gas consumption in the three months 1st December 2017 to 28th February 2018 was roundly 16,200 kwh. For the three months 1st December 2018 – 28th February 2019, it was roundly 13,500 kwh. That’s a 15% reduction.
While the more recent December and February figures were lower than the previous year, the more recent January one was not.
This, I think, highlights the fact that
• the weather might have been different in the two years (and no, the Beast from the East was at the end of March!)
• the pattern of bookings might have been different (because we heat the hall only when it’s about to be used – no bookings, no heat).
Because we pay monthly by direct debit, the financial impact may take a while to feed through completely. That said, we paid 20% less in January 2019 than in January 2018.
Caveats apart, it’s both interesting and heartening from a financial and environmental point of view. And it says to me that we do need to keep [the curtains and blinds] closed/drawn when possible!”
Acknowledgements – We would like to thank Mike Gibbs and Andy Sharp for providing the photos in this case study, and for providing insight into the improvements that the church is making to reduce their heat loss from the building.