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© jenny


A Punch-in App to Cultivate Eco-friendly AC Using Habits

Individual Project: UX/UI, Sustainability, UHI


ACho is designed to reduce the negative effect of urban heat island caused by urbanization. This interactive design encourages people to turn the AC temperature above 26° and participate in the course of environmental protection by connecting them with the problem sufferers, outdoor workers in this case. 

Black Marble
Design Process






  • Desk Research

  • User Research

    • Interview

    • Questionnaire

  • Persona

  • Challenges​

  • Crazy 8

  • Brainstorming

  • Storyboard

  • Stakeholder map

  • Product Sketch

  • 3D Modelling

  • UI Design

  • Reflection


How do different temperatures influence people's health?

Most people live in urban area. 

How to lower city temperature and make life better?

City heat is caused by urban heat island. 



Urbanization is the process through which cities grow, and higher and higher percentages of the population comes to live in the city.

Until 2019, over 56% of world population live in urban area. 

Urban Heat Island

An urban heat island is an urban area or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities. The problem has become increasingly severe along with the escalating urbanization.

The urban heat-island effect can raise temperatures by 5˚C to 10˚C, exacerbating heat waves.

Friends in the City

Design Goals​

Make environment a better place

Get more people involved in emission reduction

Improve heat island suffers' experience in summer

User Research


In order to understand the pain points of outdoor workers(major urban heat island sufferers) in a more in-depth and targeted manner, I interviewed outdoor workers in my neighborhood about their feelings about summer work time. 


In order to understand the attitudes of office workers(AC users) towards urban heat island and AC in an extensive way. I launched an online questionnaire to 22-50 office workers with 81 valid answers, over 90% of which work in city center. 


The weather is unbearable without AC in summer

The number of people who are willing to set AC temperature above 26˚C outnumbers those who actually do that. 

Drinking water is the most common way for outdoor workers to relieve the severe heat of summer. 

The felt air temperature in urban area is much higher than than of suburban area. 


1. How to convert people's intention into action?

2. How to benefit outdoor workers?



Connect outdoor workers & office workers

Arouse office workers’ motivation to turn AC temperature higher than 26 ˚C 


Crazy Eight

Smart Thermostat

1-Day Life Exchange

Temperature Valve

Focus Group Discussion

Communication App

Communication App

Footprint Collector

Experience Installation

Interactive Game


Stakeholder Map


There are plenty of convenience stores in urban area so that outdoor workers can easily access to water. 

Get donations from local companies and charity foundation as an environmental protection course. 


Elsa has checked in her AC temperature on ACho (26 ˚C+) for 5 days. She can now donate 2 bottles of water to outdoor workers and customize the bottle. 

Jianjun scanned the QR code on the bottle and sent a gratitude message to Elsa to thank her for the free water. 

The weather is hot in summer. Jianjun, an outdoor worker, went to convenience store to get free water. He saw the message from Elsa on the bottle. 

Low Fidelity Prototype

Device Design

Visual Identity


ACho pronounces similar to the word echo, but substitutes e with a. It symbolizes the connection between outdoor workers and office workers, and reminds people to reduce AC usage to ease negative effects of urban heat island.




资源 9017.png

UI Design


The scenario shows the process of using our product ACho. User can check in her air conditioner temperature lower than 26˚C for 7 days and customize a free bottle of water for outdoor worker. And the outdoor worker can easily get his water from our device installed in a convenience store by scanning the code. 

Image by Marcel Strauß


There are still some aspects that can be done in the future to improve this project: 

  • More usability test when the quarantine rules are less strict

  • More details into the design of the water pick-up device

Anyway,  I am quite satisfied with this project as my first approach to UX design. 

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