Multi Head Split Systems work the same as other wall-hung Split Systems with 1 major difference; they use the same outdoor compressor unit.

The indoor units can be:

• Regular wall mounted split system heads
• Slimline units which are hidden in bulkheads, so the only thing you see is a sleek horizontal grille
• Ceiling cassettes which disperse the air multiple directions
• Floor console (think space heater but an aircon)

You can also mix and match. Our above photos show one of our townhouse installs which had 8 indoor units of various styles connected to 2 outdoor units.

The outdoor units will run multiple indoor units. What size unit depends on how many KW you need inside.

For example, if 2 rooms need 2.5kw air cons and 1 room needs a 5kw, that’s 2.5 x 2 + 5 = 10kw. So you will need an outdoor unit which can handle at least 10kw.

Different brands and models can handle different KW and number of heads connected.

This usually ranges from 3-5 heads ranging from 7.5-12kw.

We generally install Multi Split System air conditioners in dwellings where the is no roof space for a ducted system, such as townhouses, units and ground floors of double story houses.

The reason being is cost.

Twin or 3 head multi split system cost less than a ducted system, but once you are looking at 4 or more heads, the cost is the same as installing a ducted reverse cycle system. Except with the ducted system, you will have 7 or more outlets.