How can I choose the correct air conditioner?

The correct choice of an air conditioner should include:

• The needed capacity in Btu/h or in Watt
• If there is a technical support from the dealer
• The air conditioner should have ecological refrigerant
• To be supplied with contemporary filters
• To have low cost operation (high energy class)
• Silent operation
• To be certified by international organizations and have CE
• To be accompanied with warranty