Draughty
/ˈdræfti/
Definition 1 of 1
Pro Tip 1/3Physical Discomfort
Describes a lack of warmth or insulation, leading to discomfort from the cold air. 
I need to fix the insulation to stop this room from being so draughty.
Pro Tip 2/3Specific Locations
Often used with parts of a building where air penetrates, like windows or doors. 
I can feel a draught coming from the windows; they are really draughty.
Pro Tip 3/3Building Condition
Implies that the building or structure is old or not well-maintained. 
The rented flat is charming but very draughty in the winter.