> Windows and doors are normally the weak spot. Standard double glazing has a U value of about 2. Depending on the coating and the position, they can also let in up to 2kw/m2 of heat through solar gain.
Also do be careful of thermal bridges and missing seals at and around the frame.
My current rental is relatively well insulated all in all, but one of the huge weakpoints is the stone sill of one of the east-facing windows, I don’t know what the builders fucked up but in winter it can literally serve as a fridge.
Also do be careful of thermal bridges and missing seals at and around the frame.
My current rental is relatively well insulated all in all, but one of the huge weakpoints is the stone sill of one of the east-facing windows, I don’t know what the builders fucked up but in winter it can literally serve as a fridge.