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Entry transition / thermal buffer spaces (unconditioned buffer zones e.g. north-facing utility rooms; solar buffer spaces e.g. south-facing attached sunspace/greenhouse)

Unheated volumes placed between inside and outside so that the temperature step happens somewhere other than at the occupied wall.

Solutions

• South-facing attached sunspace / solar greenhouse: A glazed room built against the south wall of the house, like a small greenhouse. The sun warms the air and the floor inside it, and that warmth passes into the
• North-facing unheated utility buffer room: An unheated room such as a garage, pantry or hall placed along the north side of the house. It sits between the cold outside and the heated rooms, so the living