Best Smart Thermostats of 2025, Picked by 5 Leading AIs
We gave 5 top AIs—GPT-5, Claude, Gemini, Grok, and DeepSeek—one mission: rank the best smart thermostats after analyzing thousands of reviews and specs. Their heated debate uncovered key features like energy savings and integrations, delivering this AI-verified verdict.
No.1 AI-Picked Product
We had 5 AI models rank their top 5 products. We tallied the scores. Here's the winner with the highest score.
ecobee Smart Thermostat Premium
The ecobee Smart Thermostat Premium was ranked #1 by 4 out of 5 AIs, earning the highest total score of 18 with an average rank of 1.5 across appearances. It won for its top-tier energy savings via SmartSensors for occupancy and room-specific control, plus built-in air quality monitoring that optimizes comfort. Seamless integrations with Alexa, Siri, Google Assistant, and HomeKit, combined with easy installation on 24V systems, drove standout user satisfaction.
What Each AI's Top Pick:
"Top-tier energy savings with room/occupancy SmartSensors, built-in air quality monitoring, and a high-quality display. Easy to install on most 24V systems (including heat pumps and accessories) and integrates seamlessly with Alexa, onboard Siri support, Google Assistant, and Apple HomeKit, earning standout user satisfaction."
"Leads the market with advanced AI learning capabilities that automatically optimize energy usage, saving users up to 23% on heating and cooling costs. Exceptional compatibility with 99% of HVAC systems and seamless integration with Google Home, Alexa, and Apple HomeKit makes it the most versatile choice."
"It remains the top choice due to its proven, self-learning algorithm that automatically creates energy-saving schedules based on user behavior. This unmatched “set it and forget it” simplicity, combined with a premium design, provides the most intuitive and effective energy management experience."
"This thermostat tops the list due to its exceptional energy efficiency through AI-driven learning that adapts to user habits, saving up to 15% on heating and cooling costs. It offers seamless installation in under 30 minutes, broad compatibility with most HVAC systems, deep integration with Google Home and Alexa, and high user satisfaction from its intuitive app and remote sensors for multi-room control."
"Ranked #1 for its superior energy efficiency with occupancy detection, seamless smart home integration including Apple HomeKit and Alexa, and advanced air quality monitoring that sets it apart in 2025."
The AI Smart thermostat Leaderboard
See the total score and rank each product received from every AI model
ecobee Smart Thermostat Premium
Google Nest Learning Thermostat (4th Generation)
Emerson Sensi Touch 2 Smart Thermostat
Honeywell Home T10 Pro Smart Thermostat
Google Nest Learning Thermostat
Google Nest Learning Thermostat (2025 Edition)
Google Nest Learning Thermostat (3rd Generation)
ecobee SmartThermostat with Voice Control
Amazon Smart Thermostat
Honeywell Home T9 Smart Thermostat with Sensor
Honeywell Home T9 Smart Thermostat
Emerson Sensi Touch Wi-Fi Thermostat
Amazon Smart Thermostat (2025 Version)
Johnson Controls GLAS Smart Thermostat
Mysa Smart Thermostat for Electric Baseboard Heaters
See Each AI's Full Top 5 Ranking
Here's exactly how each AI ranked the products. Click on each AI to see their complete, unedited reasoning.
GPT-5's Top 5 Rankings
Claude Sonnet 4's Top 5 Rankings
Gemini 2.5 Pro's Top 5 Rankings
Grok 4 Fast's Top 5 Rankings
DeepSeek V3's Top 5 Rankings
How We Calculated the Winner
Our 100% data-driven, transparent process
Ask Each AI for Their Top 5
We ask GPT-5, Claude Sonnet 4, Gemini 2.5 Pro, Grok 4 Fast, and DeepSeek V3 to independently rank their top 5 products.
Apply Point System
Rank #1 = 5 points • #2 = 4 points • #3 = 3 points • #4 = 2 points • #5 = 1 point
Calculate Total Score
We add up the points from all 5 AIs. The product with the highest total score becomes our #1 AI-Picked Product.
You Decide
We show you the data. You make the choice based on your priorities and needs. This is a 100% data-driven process—we don't change the results.
Our Process
Independent Analysis
We ask ChatGPT-4, Claude 3.5, Gemini, and Perplexity the same question separately. No AI sees another's answer.
Full Transparency
You see everything: their reasoning, sources, pros, cons. We don't hide disagreements or cherry-pick answers.
You Decide
We present the data. You make the choice based on your priorities, budget, and needs. Because you're absolutely right.
Updated Monthly
Product markets change. We re-run AI debates monthly to keep recommendations current.
Affiliate Disclosure: We earn from qualifying purchases through Amazon Associate links. This helps us maintain this free service. Our AI debates are independent and unbiased—we don't influence what AIs recommend.