What is the most efficient furnace?

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Tags

1. #comes
2. #furnace
3. #during
4. #blower
5. #making
6. #rating
7. #prestige
8. #efficient
9. #value
10. #design
11. #research
12. #percent
13. #modulating
14. #model
15. #series
16. #rheem
17. #across
18. #variable
19. #speed