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Table of Contents

1 Introduction
2 Is it for me?
3 How much does it cost?
4 What are the benefits?
5 Step by step guide
6 Case study
7 Where can I find out more?

What are the benefits?

Obviously if you reduce refrigeration loads inside the room, by achieving the same comfort state with natural ventilation or fans, you will be able to save energy and money.

Selecting the correct air conditioning system will also save you money for years. In fact, buying the most energy-efficient model on the market can cut your air conditioning electrical costs by up to 30 percent a year. Table 1 shows an example of the annual energy savings obtained by replacing a current air conditioner with an efficient one.

Table 1: annual cost savings with the use of an energy-efficient air conditioner

Size of the air conditioner, kW 3
Old air conditioner efficiency (COP) 2.2
New air conditioner efficiency (COP) 3.5
Hours of use per year 1000
Utility costs, €cts/kWh 0.06
Current energy consumption, kWh/year 1365
New energy consumption, kWh/year 835
Annual cost savings, € 30.71

COP Coefficient of Performance = ratio of the refrigeration effect to the network input, kW:kW

Minimizing the use of air conditioners and using energy-efficient systems can also reduce the probability of the more frequently occuring electrical brownouts caused by excessive demand in the summer.