Every home has its quirks.

For one family in Black Rock, the quirk was a heating and cooling setup that couldn’t keep up. Upstairs, the bedrooms were uncomfortable through summer and not much better in winter. Downstairs, the open-plan living areas were a different environment entirely. One system was trying to handle all of it, and it was struggling.

It’s a situation we come across fairly often in two-story Melbourne homes. The layout works against a single system, and over time the compromises start to add up.

When the family got in touch, they weren’t sure what the answer was. They just knew what they had wasn’t working.

Understanding How the Home Was Used

Before anything else, we spent some time understanding how the family actually used their home day to day.

The kids were upstairs most evenings. The adults were downstairs in the kitchen and living areas until later at night. Mornings were busy on both levels. On weekends, the whole family was downstairs together for most of the day.

Once you understand the rhythms of a home, the right approach usually becomes clearer. In this case, it was obvious that upstairs and downstairs had genuinely different needs, and that trying to meet both with one system was always going to mean one zone was being compromised.

The decision was made to install two separate reverse cycle ducted systems, one for each level.

Upstairs: Mitsubishi Electric Reverse Cycle Ducted System

For the bedrooms, we went with a Mitsubishi Electric reverse cycle ducted system.

Mitsubishi Electric has a solid track record in Australian homes. Their ducted systems are known for running quietly, which is particularly relevant for bedrooms where noise from a unit can become disruptive over time.

The system sits in the ceiling space above the upper level, with vents running through each bedroom. It operates independently from downstairs, so the family can set it to whatever they need at night without affecting the rest of the house.

For the bedrooms specifically, having that independence made a noticeable difference. The rooms that were always either too warm or too cool in the old setup were now consistently comfortable.

Downstairs: Braemar Dominator Reverse Cycle Ducted System

The downstairs zone was a bigger space to condition. Open-plan living areas with a kitchen included are harder to get right. There’s more volume, more activity, and more variables affecting the temperature throughout the day.

For this level, we installed a Braemar Dominator reverse cycle ducted system.

The Braemar Dominator is an Australian-made unit that handles larger spaces well. It’s not overly complicated to manage, and it’s built with the Australian climate in mind, which matters in Melbourne where conditions can shift dramatically across a single week.

The system covers the kitchen, dining, and living areas downstairs. The family can run it during the day and evening independently of whatever is happening upstairs, which is exactly what was needed.

Why Two Systems Instead of One

This is the part worth explaining properly, because it’s not always the obvious choice.

There’s a reasonable assumption that one large ducted system covering the whole home is simpler and more practical. And for some homes, that’s true. But two-story properties often have a natural separation between how the upper and lower levels are used, and that separation can work in your favour if the heating and cooling setup reflects it.

A few things that informed this decision on the Black Rock project:

Heat rises. Upstairs rooms naturally run warmer in summer. A system set up to handle the living areas won’t necessarily get the bedrooms right, and calibrating for the bedrooms can leave the living areas under-serviced.

The levels are used at different times. Running a full whole-home system overnight just to keep the bedrooms comfortable isn’t necessary when only the upper level needs conditioning. Two systems allow each zone to run on its own schedule.

Separate systems don’t depend on each other. If one needs a service or develops a fault, the other level of the home keeps running normally. With a single whole-home system, a problem means the whole house is affected.

None of this is to say two systems is always the right answer. Every home is different. But for this particular property and this particular family, it made clear sense.