Heat Pumps

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