| 11. | Geothermal heat pumps are economically viable essentially anywhere in the world.
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| 12. | I never really would have thought a heat pump would be that significant.
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| 13. | The product range includes biomass boilers, solar collectors and heat pumps.
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| 14. | Air-source heat pumps are inexpensive relative to other heat pump systems.
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| 15. | Heat pumps and oil-fired furnaces and boilers need a yearly tune-up.
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| 16. | Air-source heat pumps are inexpensive relative to other heat pump systems.
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| 17. | New improvements included modern electrical equipment and a geothermal heat pump.
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| 18. | Heat and design culculation of refrigeration machines, heat pumps and heat-transformers.
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| 19. | Lapka offered another alternative to heat the apartment : heat pumps.
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| 20. | Air source heat pumps can provide fairly low cost space heating.
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