25-27C around the house surprising how it stay warm despite very cold weather outside for 2 days. I had all the windows shutters installed last Friday and since it installed the house temps had no longer drop a lot at nights as the shutters keep out fully the cold glass feed in. When I opened it you can feel the very cold air between the shutters and glass rush in but still not effect the current temps.
Last month June 1 day hot spell the house temps went to to 28-30C, it quickly drop back to 20-21C in 2 days time. The shutter man fitter told me that those shutters will keep your house very warm and in winter when heating cone on will warm up quickly and heating goes off. and stay off long time.