Write a comfort brief for each room
For bedrooms, consider operability and applicable escape requirements. For living rooms, discuss daylight and glare. For kitchens, consider handle reach and how steam is managed.
Compare equal glass packages
Style comparisons are clearer when the glazing specification is consistent. Have the provider call out differences in product ratings when switching between fixed and operable units.
Plan for your property
A warmer room is not always a window problem. Look at drafts, shade, orientation, and installation details together. Compare documented product ratings instead of relying on a promised energy saving.