Passive house

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Across
  1. 3. Thermal “******”. Lack of continuity in a wall causing heat loss
  2. 5. causing little or no damage to the environment and therefore able to continue for a long time
  3. 6. a high temperature that is comfortable but not hot
  4. 7. the flat surface of a room on which you walk
Down
  1. 1. a thick, flat piece of a solid substance, such as stone or concrete that is usually square or rectangular
  2. 2. completely closed so that no air can get in or out
  3. 4. material that is used to stop heat, sound, or electricity from escaping or entering