A common mistake is fixing what you see rather than what hurts. A cool room may require a larger heater, but draughts around windows or holes under doors are the underlying problem. You must pay more to fix the unpleasant room. Look for patterns. Rapid cooling following heating. Does one side of the house feel different? Can windy days increase issues? These symptoms indicate heat loss due to insulation gaps, ventilation issues, or deteriorating glazing.

Oversealing Without Managing Ventilation
Draught-proofing is beneficial, but overscaling is detrimental. Older homes “breathe” through chimneys, tiny gaps, and worn materials. Lack of ventilation can cause condensation and stuffiness. A balanced approach works. Seal obvious draughts in kitchen and bathroom vents. Use extractor fans and air bricks. Short bursts of fresh air in bedrooms provide comfort without losing warmth.