Fireplace draughts/chimney air infiltration can easily be the single largest contributor of air leakage in homes throughout the world. Next in line would be evaporative...
A door seal and window seal to fix up those inconsistent gaps in doors and windows around the house, without having any trouble opening and closing the door afterward...
Have you got a hot roof? Insulation consistency is what really works. Insulation is King. Non-motorized or motorised roof ventilation can struggle to reduce uninsulated...