Central Air Conditioners: What to Look For. There are several factors you must consider when looking for the best central air conditioner. You must consider the size of the device and the amount of energy it uses. .

Window Units Vs Central Air. Probably not. Central air is more efficient in theory,(Slate) but central systems also frequently suffer duct leakage which window units don't, so from a practical perspective, they're probably about the same. In a test of 200 houses it found that leaky ducts waste 27% of air conditioning in an average home. .

Choose to Use Efficient Inverter Technology. When replacing HVAC systems, consider high-efficiency units. Replacing air conditioners that are more than 10 years old can save 20-40 per cent of your climate related energy costs annually, and reduce your carbon emissions.7 New inverter technology can save up to 30 per cent of energy consumption, compared to conventional air conditioners. .

Avoid Losses Through Windows. Double-glazing windows can reduce heat loss during winter and also the amount of heat gain during summer. In cooler months, up to 40 per cent of your generated heat can be lost through the windows.4 The use of shades, drapes, blinds and tinting can be used as climate control tools. .

Install Economisers And Invest in Green Energy. Energy can be saved if inside cooling is required when the outside temperature is lower than the inside temperature by using economisers. These take fresh air from the outside for cooling rather than using refrigeration equipment to cool re-circulated air. .

Avoid Unnecessary Lighting And Maintain Filters. Turning off lights in unused areas and replacing incandescent light bulbs with compact fluorescent (CFL) or LED globes may not only result in lower electricity usage but also in less heat being emitted, potentially saving on air conditioning and ventilation running costs. .