Villa Colina Tropical was built according to some of the concepts of "Passive House." Huge windows of a high quality, provide natural heating during the very sunny winter months. (If by bad luck there was no good weather for several days, the radiators would take over maintaining a temperature of 21 degrees during the day, 19 degrees at night.) Thick "green roof" and walls of ceramic airbricks providing excellent thermal insulation.
Venting skylight for summer ventilation , healthy coated lime / hemp ...