4.2 kW

Panasonic RZ 4.2kW Split System

Model CS-RZ42XKR / CU-RZ42XKR

The 4.2 kW Panasonic RZ Split System cools a room of up to about 30 to 36 square metres as a guide. That is from Mitsubishi Heavy Industries' sizing chart for an insulated room: the larger figure if it faces north, the smaller if it faces east. Sun exposure, ceiling height and insulation move those figures, which is why we confirm sizing before we quote.

Part of the Panasonic RZ Split System range, Panasonic's split system line, in 7 sizes. Running costs below use the Sydney median rate; the Eastern Suburbs and Western Sydney pages cost systems on their own network tariffs. Check the size against your rooms, compare it with other 4.2 kW options, or ask about supply and installation.

All Panasonic RZ Split System sizes

2.5kW 3.5kW 4.2kW 5kW 6kW 7.1kW 8kW

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Supply & install pricing

Fixed price in writing before work starts

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1300 300 302

24/7 emergency repairs Manufacturer warranty + our workmanship warrantyPhotos & details get you a sharper price

Energy efficiencyRegistered: CU-RZ42XKR / CS-RZ42XKRW

3.5 starsCooling ratingSydney climate zone

2.5 starsHeating ratingSydney climate zone

339 kWhCooling energy / yearabout $112 at the Sydney median rate

672 kWhHeating energy / yearabout $223 at the Sydney median rate

3.53AEERACOP 3.73

What it costs to run

About $335 a year at the current Sydney median electricity rate: $112 of cooling plus $223 of heating, from the official GEMS test figures.

The Panasonic RZ 4.2kW uses 339 kWh per year for cooling and 672 kWh per year for heating under official GEMS testing conditions for Sydney's climate zone. These figures reflect the system's actual energy consumption in typical Sydney conditions and are the basis for your running cost estimate, which varies with current electricity rates.

The system carries a 3.5-star cooling efficiency rating and 2.5-star heating efficiency rating for Sydney. It achieves a rated cooling efficiency (AEER) of 3.53 and heating efficiency (ACOP) of 3.73. The unit uses R32 refrigerant.

Source: Australian GEMS registry · median of 170 Sydney residential tariffs, including GST · Refreshed monthly · Last updated October 2026

The details