如何计算Energy Star Rating
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Energy Star ratings compare appliance efficiency to similar models. Higher ratings indicate better energy performance and lower operating costs.
分步指南
- 1Appliances tested by EPA/DOE for standardized efficiency
- 2Must be top 15-25% most efficient to earn Energy Star
- 3Annual cost calculation helps consumer decision-making
例题解析
输入
Refrigerator, Energy Star rated, 10% better efficiency
结果
Saves ~$100/year vs. standard, pays for cost difference in 5-8 years
Typical appliance
常见错误注意事项
- ✕Ignoring size differences (larger appliance uses more energy regardless of rating)
- ✕Not accounting for age replacement (old appliance less efficient than new standard)
常见问题
Is Energy Star worth the higher upfront cost?
Usually yes; efficiency premium payback in 3-8 years depending on use, then savings continue.
Are all appliances available with Energy Star?
No, only selected categories: refrigerators, washers, AC, water heaters, etc.
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