The house I purchased had these hideous perfect fit blinds in two bedrooms. I have had these removed and replaced with motorised roller blinds in all three bedrooms. Two of the bedrooms are so cold, I've had the heating checked and a new boiler put in. The two which are cold are the ones which has those perfect fit blinds, which fit inside the frame. I think the glazing loosens in the frame and there is now a draft. What can I get as a draft excluder, sealant. I've looked online and I can't find anything for the inside of the frame.