Smart Home Design: Why High-Performance Homes Start with the Basics

Recently, Michael Drage from reimagined habitat joined a podcast session hosted by Jill Absolom titled:

Podcast Session: “Ask the Expert: Smart Home Design for Builders and Renovators.”

The conversation explored what actually makes a home perform — not just in terms of energy efficiency, but in terms of comfort, health, and long-term value.

This blog post is a summary of that discussion, capturing the key insights and practical takeaways for homeowners, builders and renovators.

It’s Not Just About Energy — It’s About Health

When we talk about high-performance homes, the conversation often starts with energy efficiency.

Lower bills.
Reduced energy use.
Better ratings.

All important.

But in practice, that’s not what most people are actually looking for.

More and more, we’re seeing homeowners come to us because of something deeper:

They want a healthier home.

People with respiratory conditions.
Families with young children.
People dealing with chronic health issues.

What they are really asking for is simple:

👉 A stable indoor environment.

Not a home where heating and cooling systems are constantly switching on and off.
Not a home where temperatures swing throughout the day.
But a home that feels consistent.

Because that consistency has a direct impact on both physical and mental wellbeing.

What Actually Makes a Home Perform?

At reimagined habitat, we analyse around 1,000 homes every year.

Different climates.
Different designs.
Different budgets.

But the outcome is remarkably consistent.

When it comes to performance — whether that’s comfort, energy use, or health — two elements stand out above everything else:

1. Airtightness

2. Windows and glazing

Not the finishes.
Not the appliances.
Not the technology.

Just these two fundamentals.

Windows: The Weakest Link in the Envelope

Windows play a much bigger role than most people realise.

They are typically the weakest part of the building envelope when it comes to thermal performance.

That means:

• Heat escapes through them in winter

• Heat enters through them in summer

And this has a direct impact on:

• how much heating you need

• how much cooling you need

• how comfortable your home feels

Improving window performance isn’t about luxury.

It’s about reducing demand — so your home needs less energy to stay comfortable in the first place.

Airtightness: The Hidden Driver of Comfort

If there is one concept that changes how a home performs more than anything else, it’s airtightness.

Airtightness is measured in air changes per hour (ACH) — essentially how often the air inside your home is replaced with outside air.

Let’s put that into context:

• A typical new Australian home: 10–15 air changes per hour

• Older homes: 30–40+ air changes per hour

• A well-performing home: around 2 air changes per hour

• Passive House target: 0.6 air changes per hour

That’s an enormous difference.

Why This Matters

Every time air leaks in or out of your home:

• you lose heat in winter

• you gain heat in summer

• your heating and cooling systems have to work harder

Think of it this way:

If your home is leaky, you’re constantly trying to heat or cool new air.

If your home is airtight, you’re maintaining the temperature of the air already inside.

The home starts to behave like a thermal battery — holding onto warmth when you need it, and keeping heat out when you don’t.

A Simple Example

In a typical leaky home, you might need to condition:

👉 up to 1,500 cubic metres of air per hour

In a more airtight home:

👉 that might drop to 200 cubic metres per hour

That’s not a small improvement.

That’s a fundamental shift in how the building performs.

You Don’t Need to Start from Scratch

One of the most important things to understand is this:

You don’t need to build a new home to improve performance.

Even small changes can make a noticeable difference.

For existing homes or rentals, simple steps like:

• sealing gaps around windows

• improving door seals

• adding draft stoppers

can significantly reduce unwanted air leakage.

These are low-cost, practical measures — but they can have an immediate impact on:

• comfort

• energy use

• how your home feels day to day

Building New? The Details Matter

If you are designing or building a new home, airtightness doesn’t happen by accident.

It comes down to execution.

Every junction.
Every penetration.
Every connection.

Because in reality:

Airtightness is “death by a thousand cuts”.

A small gap here.
A small gap there.

Individually, they seem insignificant.

But together, they can completely undermine performance.

This is why design, detailing, and quality control matter so much.

A Different Way to Think About Homes

We often think about homes in terms of what we can add:

• bigger systems

• more technology

• higher specifications

But high-performance homes are not about adding more.

They are about losing less.

Less heat escaping.
Less heat entering.
Less energy required to maintain comfort.

And when you get that right, everything else becomes easier.

The Outcome

When the fundamentals are done well — airtightness and windows in particular — the results are clear:

• more consistent indoor temperatures

• reduced reliance on heating and cooling

• lower energy use

• improved comfort

• better health outcomes

And importantly:

👉 a home that simply feels better to live in