Ducted Air Conditioning in a Double-Storey Home in Albury-Wodonga

Almost every owner of a double-storey home in Albury-Wodonga tells us the same thing. In January the bedrooms upstairs are still hot at ten o'clock at night, while the living area downstairs is fine. In July it flips, and the ground floor feels cold while warm air collects on the landing. A ducted system can fix that, but only if it is designed for a house that behaves like two buildings stacked on top of each other.

This guide covers what is different about ducting a double-storey home and the questions worth asking before you accept a quote. If you are still working out capacity or zone count in general, our guides What Size Ducted Air Conditioner Do I Need? and Ducted Air Conditioning Zoning in Albury-Wodonga: Is It Worth It? cover those in more detail.

Why the two floors never agree

Warm air rises. In a single-storey house that mostly means a warm ceiling. In a double-storey house it means the whole upper floor runs warmer than the ground floor, and the stairwell acts as a chimney that carries heat straight up. Upstairs also sits directly under the roof, which in this region soaks up a great deal of summer sun, so the bedrooms are being heated from above and below at the same time.

The result is that the two floors want different things at the same moment. In summer, upstairs needs far more cooling than downstairs. In winter, downstairs needs more heating while upstairs is often comfortable on its own. A system that treats the house as one space will always overcool one floor to fix the other.

The ducting problem nobody mentions

A single-storey home has one roof space that reaches every room. A double-storey home usually has two separate cavities: the roof space above the upper floor, and the gap between the downstairs ceiling and the upstairs floor. That middle cavity is full of floor joists, plumbing and wiring, and it is rarely deep enough to run ducting freely.

That leaves a few options. Upstairs rooms are normally served from the roof space above them, which is the easy part. Downstairs rooms can sometimes be reached through the floor cavity where joist direction allows, through a bulkhead, through a riser built into a cupboard or wall, or by running ducts down to floor outlets in some layouts. Each of these has a cost and a look, and the right answer depends on how your house was framed. This is the main reason we will not quote a double-storey home without getting into the roof and looking at the floor structure first.

One system or two

There are two broad ways to air-condition a double-storey house with ducting.

The first is a single system with the indoor unit in the upper roof space and zoning that separates the floors. It is usually the cheaper option to install, there is one outdoor unit to place, and it works well where the downstairs can be reached without major building work. The catch is that one unit has to serve two floors with very different loads, so zone design, sensor placement and return air position matter even more than usual.

The second is two separate systems, one for each floor, each with its own outdoor unit and controller. It costs more up front and needs space for two outdoor units, but each system can be sized for its floor and run independently. On larger homes in Thurgoona, Baranduda and the newer Wodonga estates, where the upper floor is a full bedroom level, two systems are often the more comfortable long-term answer.

Neither is automatically right. We size each floor separately on the heat load it actually carries, then compare the two approaches on cost, running cost and how you use the house.

Return air and sensors

On a single system serving both floors, where the return air grille sits changes how the whole house feels. A return on the upper landing pulls in the warmest air in the house, which helps in summer but can fool the system in winter into thinking the house is warmer than it is. Some double-storey homes are best served by a return on each floor, or by zone sensors that read each area rather than relying on a single thermostat in the hallway.

If a quote shows one return and one controller for a two-storey home without any discussion of this, ask why.

Reverse cycle and the winter side

Plenty of double-storey homes around Albury-Wodonga were built with gas ducted heating through floor vents and a separate cooling system, or no cooling at all. Our Reverse Cycle Ducted Installation service can replace both with one system per house or per floor, while Add-On Refrigerated Cooling can sometimes pair cooling with a heater that still has life in it. In winter, ceiling outlets on the ground floor work against the natural rise of warm air, so outlet position and airflow need more thought than they do upstairs.

Before you get quotes

It helps to know a few things before anyone climbs into the roof. Which rooms do you actually use at the same time? Is the upstairs a full bedroom level or a single room and bathroom? Where could one or two outdoor units go without sitting under a bedroom window? Do you already have ductwork, and is it from an old evaporative or gas system?

Bring those answers to the inspection and the conversation moves quickly. If you are weighing up a refrigerated ducted system for a two-storey home in Albury, Lavington, East Albury, Wodonga or Baranduda, get in touch and we will look at both floors, explain the options plainly and give you a fixed price after inspection.