Our Simple Social Experiment...
The Ice Box Challenge is the ultimate showdown between a standard NZ code build and a high-performance Passive House.
We place two identical looking "boxes" in the summer heat, each holding a giant block of ice.
It’s a simple, visual experiment that lets you see the difference for yourself—proving just how powerful better insulation, superior windows + glass, airtightness, and quality design really are.
"We’re all here to prove that building energy efficient buildings isn't complicated - it’s just a smarter way to build. Better comfort, better health, cheaper running costs and a better life. Simple."
- Lenny Basham, "Ice Box" Director
Proud Sponsors
Mitre 10 New Zealand
Mitre 10 is proud to support the Ice Box Challenge, which brings to life one of the biggest issues in New Zealand homes; overheating and poor energy performance.
This simple experiment shows how better building design can keep homes cooler, healthier, and more efficient, especially as our summers get hotter and energy costs rise.
Together with industry partners, we’re highlighting practical, accessible ways to lift building performance.
The Ice Box Challenge is a great way to spark conversations about smarter materials and design, and we’re excited to help bring this message to communities across Aotearoa.
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Weathershield Windows & Doors
Weathershield Windows & Doors is chuffed to be involved with the Ice Box Challenge NZ. With the desire to help educate the public on the availability of quality NZ made products.
Built around a belief that beauty doesn’t have to compromise performance, Weathershield Warmcore aluminium windows were created out of a desire to combine the desirability and durability of aluminium with unparalleled insulation.
The unique, full width thermal core is key to why Weathershield windows are up to 75% more thermally efficient than traditional New Zealand aluminium systems.
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Metro Performance Glass
Metro believe the Ice Box Challenge is a perfect example for us to demostrate how inportant the right choice of glazing is any kiwi home.
For over 38 years we’ve been pioneers in keeping New Zealanders warm, safe and dry through better glass technology.
We believe that glass can enhance the beauty and comfort of any living space. Our diverse glass range can transform rooms into stunning features, adding elegance and sophistication.
With our high performance Low E glass, homes become more energy-efficient, reducing the need for heating and cooling, which helps lower energy bills.
"Think of 'Fabric First' like a really high-quality chilly bin.
If the insulation is quality and the lid seals tight, your drinks stay ice-cold all day without needing a fridge motor running. We design & build your house the same way - focusing on quality windows + glazing, the right levels of insulation, airtightness, mechanical ventilation with heat recovery.
All to keep the scorching sun out. It means the house stays naturally cool, so you don’t need to blast the air con just to stop from melting on the couch."
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Genia Timber
PARTICIPANT STORIES
Sarah's Experience
"Participating in Ice Box Challenge NZ was eye-opening. I witnessed firsthand the impact of high-performance insulation and quality windows on preserving the ice blocks, even in scorching heat."
David's Review
"Attending the educational workshops at Ice Box Challenge NZ was informative and engaging. I gained a deeper understanding of the significance of high performing glazing and airtightness in creating energy-efficient buildings."
Rachel's Feedback
"The information session at Ice Box Challenge NZ provided valuable knowledge about sustainable building practices. I highly recommend it to anyone interested in energy-efficient solutions."
CONTACT
Connect with Us
To learn more about our public demonstrations, educational workshops, and information sessions, feel free to reach out to us. We are committed to promoting awareness about sustainable building practices and energy-efficient solutions.