Heat Pumps

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Across
  1. 1. number of units in a heat pump
  2. 3. size that keeps heat pump energy efficient
  3. 4. person credited for developing the first geothermal heat pump
  4. 9. person who started the heat pumps scientific principle
  5. 10. 3 of 4 types of heat pumps
  6. 12. you have to do this to makes sure everything is still good with the heat pumps
  7. 14. 1 of 2 things you don't have if there's a power cut
  8. 15. one thing all heat pumps save for people
  9. 17. 4 of 4 types of heat pumps
  10. 19. 2 of 3 things all heat pumps are
  11. 20. 2 of 2 things that makes heat pumps less energy efficient
  12. 22. 2 of 4 types of heat pumps
Down
  1. 2. 1 of 4 types of heat pumps
  2. 5. 3 of 3 things all heat pumps are
  3. 6. uses this instead
  4. 7. 1 of 3 things all heat pumps are
  5. 8. person normally held responsible for the scientific concept
  6. 11. used to circulate refrigerant that absorbs and releases heat as it travels between the indoor and outdoor units
  7. 13. 2 of 2 things you don't have if there's a power cut
  8. 16. 1 of 2 things that makes heat pumps less energy efficient
  9. 18. the air what inside unit of a heat pump
  10. 21. doesn't use this