What is reverse cycle?
A reverse-cycle air conditioner can heat as well as cool – in fact, it's one of the cheapest ways to heat your home in winter. 

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In cooling mode, a split-system air conditioner extracts heat from the indoor air and moves it outside, via the refrigerant gas in the pipes connecting the indoor and outdoor units. The outdoor unit releases the heat and pumps the cooled refrigerant back to the indoor unit where the cycle continues. In heating mode, the process is simply reversed, to extract heat energy from the outdoor air and sends it indoors (yes, even in cold weather there's some heat energy in the outdoor air).

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What size air conditioner do I need?

Here's our rough guide to the air conditioner capacity (size) you'll need for a particular room size. 

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Room size            Capacity

Up to 20 m2         2–2.5kW

20–40 m2              2.5–5kW

40–60 m2              4–6kW

60–80 m2              5–7kW

80+ m2                 6–9kW

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So, that's the ballpark guide, but you really need to do an accurate calculation before buying your air con, or else you'll run into these issues:

• Models too powerful for the room size may run frequent short cycles to achieve the target temperature. This can result in the room getting too cold or hot, inadequate dehumidification (i.e. not drying the air enough, making the room feel less comfortable), increased power consumption and running costs, and wear and tear on the system.

• Underpowered models may have to run more often at maximum output, which could dry the air too much and also create excessive wear.

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