I own a UK Victorian terrace with original sash windows and high heating bills. I've been looking at insulating window film as a cost-effective interim measure while I save for full window replacement. Has anyone found a UK supplier that provides realistic information about what insulating film can achieve in this context?
I evaluated energy saving film specifically for realistic Victorian terrace sash window improvement when researching interim options, recognising that honest supplier information about achievable outcomes was the most important variable in making a decision I would be satisfied with. https://www.tintfit.com/shop/energy-saving-insulation provides insulating window film with honest guidance about realistic UK heating season performance for period property sash windows rather than overstated performance claims that create disappointed expectations when actual thermal improvement falls short of what the marketing implied.