**Summer and Winter Heat Gains** − **Losses Comparative by Climatic Zones**

**Figure 12.** Heat gains and losses of the thermal envelope for summer and winter. The heat gains are reported by heat transference channel: (A) exterior walls, (B) ground contact walls, (C) interior partitions, (D) exterior ceilings, (E) ground ceilings, (F) interior ceilings, (G) open-air floors, (H) ground-contact floors, (I) interior floors, (J) thermal bridges, (K) windows radiation (solar) heat gains, (L) windows' conductive heat gains, (M) internal gains, and (N) air infiltration and ventilation.
