What is green HVAC?

Related questions

1. What is HVAC unit?
2. How does a commercial HVAC system work?
3. How much do HVAC systems cost?
4. Is furnace part of HVAC?
5. What is split HVAC system?
6. Why HVAC system is required?
7. What is a complete HVAC system?
8. What does HVAC consist of?
9. What is HVAC system in building?
10. What are types of HVAC systems?

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20. #government
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22. #green
23. #conserve
24. #customers
25. #facilities
26. #friendly
27. #environmentally
28. #results
29. #resources