Building structures

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Across
  1. 3. it carries off waste water
  2. 5. they are outside the house to tally the amount of electricity used
  3. 6. a container for rainwater
  4. 8. organic elements that can be converted into fuel
  5. 9. it transports hot or cold air around the house
  6. 11. a system for keeping a building warm
  7. 12. when you spend less money than expected
Down
  1. 1. a device to heat rooms
  2. 2. synonym for tubes
  3. 4. it can be in your kitchen above the stove or in the bathroom
  4. 7. where you put your phone to charge
  5. 9. application of digital technology to home life
  6. 10. an artificial conduct to carry away waste water or refuse