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Geothermal Heating and Biofilter Integration in a Compact Microhouse

Authors:
Geuncheol Ha, Hyunmyung Kim, Seong Ryeong Kim, Minjae An
Geothermal Heating and Biofilter Integration in a Compact Microhouse
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Incorporating a movable bedroom module and a rainwater biofilter system, this compact microhouse offers innovative solutions for sustainable living in a limited footprint.
5 key facts about this project
01
Incorporates a movable bedroom module for flexible space use.
02
Features a rainwater biofilter for sustainable water management.
03
Utilizes solar panels for energy self-sufficiency.
04
Includes geothermal heating for efficient climate control.
05
Designed with a hexagonal shape to optimize spatial efficiency.

The Hexa_Zone microhouse takes a thoughtful approach to compact living, addressing the growing demand for efficient and sustainable housing solutions. Situated in a suburban area, the design highlights the importance of utilizing a small footprint to create a comfortable and practical home environment. The overall concept revolves around the idea that a smaller space can provide the same sense of comfort typically found in larger homes.

Design Concept and Layout

The structure features a hexagonal shape, allowing for maximum use of space while being economical in material consumption. It is organized into six functional zones: an entrance, toilet, kitchen, deck, bedroom, and study. These zones are interconnected by a multifunctional area that promotes easy movement and adaptability among the spaces. This layout ensures that each part of the home can serve multiple purposes, making it flexible for daily tasks.

Movable Module

A key highlight of the design is the movable module that serves as a bedroom. Positioned above the deck, this module can rotate and shift in front of the porch, providing a unique way to engage with both indoor and outdoor areas. This feature not only enhances the overall usability of the home but also offers a fresh perspective on how spaces can interact with each other.

Sustainable Features

Sustainability is a central theme of the microhouse, with a rainwater purification system that incorporates a biofilter for effective treatment of water. This system provides clean water for everyday use, which is an important aspect of resource management. Energy needs are met with solar panels that generate electricity, paired with a solar water heater that offers hot water. Together, these elements contribute to a self-sufficient energy model, lessening environmental impact.

Heating and Mobility

The indoor environment is further improved with a geothermal heating system that keeps the space warm during colder periods. This system circulates heat throughout the areas, ensuring comfort for residents. Additionally, the project encourages the use of electric kickboards for local travel, promoting eco-friendly transportation in the suburban context.

The design incorporates thoughtful storage solutions, allowing residents to keep essential items organized and accessible. Each aspect of the microhouse is carefully planned to balance functionality with a practical approach to living in small spaces. Attention to detail shows that effective design can enhance the quality of life, even in compact environments.

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The Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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