Heat Pumps

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