What are some disadvantages of energy efficiency?
Mostly the upfront cost of making energy efficiency changes. Sick buildings are also possible.
The most common hurdle for energy efficiency measures to get over is the cost of implementing a new more efficient technology. For example, say you want to change your old incandescent bulbs (which might cost around 10), means that you have to come up with $9 extra dollars (numbers are only approximate). However, you will save energy costs over the long-term and this is called "the pay back" period. This means that you will have paid back this initial extra amount and from then on, its all savings.
At a larger scale, if you are an architect and designing a high efficiency building, it might cost, again, say 100 million to build a high efficiency building. Again, you will need to do a "payback" calculation to see how long this extra investment will take before its all savings. Most developers don't like payback periods that are beyond about 2-3 years.
Another drawback that was prevalent in the 1980s but is less common today is that some homes were constructed with such energy efficiency that natural air circulation was diminished, leading to people being sick from bad air quality. This issue has been resolved, at least in North America.
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Some disadvantages of energy efficiency include initial high costs of implementation, potential inconvenience during the transition period, and limitations in achieving significant reductions in energy consumption in certain sectors. Additionally, there may be rebound effects where increased energy efficiency leads to greater consumption or use of energy, offsetting some of the intended benefits.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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