Window draft seal products can definitely help with smaller draughts around frames and openings.

If cold air is getting in around worn seals or gaps, improving those areas can make a room feel noticeably more comfortable.

But many homeowners are surprised when the house still feels cold afterwards.

That’s because windows are often only one part of a much bigger heat loss problem.

Warm air may still be escaping through loft spaces, floor junctions, cavity weak points, or hidden air leakage elsewhere in the property. In some homes, ventilation problems or insulation gaps are actually causing more heat loss than the windows themselves.

At AVT UK, we regularly assess homes where replacement windows or draught-proofing haven’t solved the issue because the real problem was somewhere else entirely.

Thermal heat loss surveys and air tightness testing help identify where the building is genuinely losing heat so you can focus on fixes that will actually improve comfort and reduce energy waste.