Xiaoming Zhang

Winter 2025 · 10 Weeks

Google Nest Thermostat Redesign

Reframing energy consumption into transparent cost feedback — shifting users from passive monitoring to active, cost-aware climate control.

UI DesignUX ResearchPrototyping

public/images/nest/hero.png

Role

Lead Prototyper / UX + UI

Year

2025

Duration

10 Weeks

Context

While Nest presents detailed energy metrics, it lacks a clear financial narrative that supports real-time decision-making. This redesign reframes energy consumption into transparent cost feedback — shifting users from passive monitoring to active, cost-aware climate control.

My Role

I led the end-to-end redesign of the Nest Thermostat mobile experience, defining a "Green & Affordable" product strategy that translates energy data into clear financial impact and behavioral feedback. I developed the interaction framework, visual system, and sustainability feedback model — aligning user research, system constraints, and business considerations into a cohesive product direction.

Problem Statement

Users seeking an eco-friendly and affordable smart thermostat often feel overwhelmed by complex interfaces and unclear energy feedback. Current products fail to balance cost-efficiency, environmental awareness, and usability for everyday households.

Unclear System Logic

Users are unsure how the system decides when to adjust, causing confusion and distrust.

Invisible Energy Impact

Users can't see how their actions save energy, reducing motivation to stay eco-friendly.

How might we visualize energy usage and savings in a way that feels concrete and motivating?

Key Insights

Users are not motivated by "saving energy" itself, but by seeing how their daily actions translate into real money and comfort.

Strategy

Convert Sustainability Into Economic Visibility — instead of presenting abstract energy metrics, I chose to visualize savings in monetary terms.

Make energy impact visible
Increase User Trust
Reduce Cognitive Load

Prototype Iterations

Iteration 01

Interaction Logic Exploration

This first prototype exposed a structural issue: users needed to move across multiple layers to access scheduling, energy feedback, and confirmation states. I chose to flatten the navigation hierarchy, prioritizing immediacy over structural purity.

public/images/nest/iteration-01.png

Iteration 02

Balancing Insight and Interaction Speed

I expanded the interface to include richer energy analytics. However, testing revealed hesitation during quick daily interactions. Reduced cognitive load enables habitual interaction.

public/images/nest/iteration-02.png

Iteration 03

Designing for Sustained Behavior

I strengthened the financial feedback loop, making savings more immediate and personally relevant. Behavioral reinforcement replaced passive visibility — amplifying financial cues to make consequences tangible.

public/images/nest/iteration-03.png

Before vs After

The redesigned home screen surfaces savings directly — making energy impact concrete and personally meaningful.

Before

public/images/nest/before.png

After

public/images/nest/after.png

Core Features

Make Saving Personal.
Eco. Simple.
Learn by Doing.
Set it once. Save every day.
Your energy. Under control.
Clear and Honest.
See Where Your Money Goes.

public/images/nest/final.png

Reflection

In future iterations, I would validate these assumptions through usability testing and behavioral metrics. The core theme throughout: turning abstract sustainability into concrete daily behavior.