If you have foamed or packed your windows too tight, this is likely to make them stiff. If the sashes tilt fine, the bottom sashes can be adjusted on the shoe bar under the sash. If you have constant force, the coils might be running dry. This can happen with building dust, plaster dust etc. This can be fixed by spraying them with a silicone spray.
Heaton Estate, Bradford Road, Bailiff Bridge, Brighouse, West Yorkshire HD6 4BW
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