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We recently redecorated our 1930s end terrace . Solid brick walls . In the bedrooms we added insulated plasterboard to the external walls, seems to be working a treat. https://www.wickes.co.uk/Knauf-XPS-Laminate-Plus-Tapered-Edge-Insulated-Plasterboard---27-x-1200-x-2400mm/p/163699
House is a typical 1910s 3 bed, end of terrace so a big end wall we can't do much about (that doesn't get any sun) and high ceilings. Double glazed but pretty old and a fair few gaps, reasonable amount of loft insulation.
It seems that the radiators were specced to look pretty rather than heat rooms up. Cast iron style and pretty small given the size of the rooms.
I tried turning the boiler down to 35 degrees and left that overnight and during the day. Possibly kept the house slightly warmer but that may just have been down to warmer temperatures outside today.
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