5 smart thermostats from our smart home devices reviews, confirmed by listing title and ranked by editorial score, then buyer rating. Catalogue updated October 3, 2026.
ecobee Smart Thermostat Premium - WiFi, Siri & Alexa$209.99 · 8.2/10Best score per dollar
Amazon Smart Thermostat, Save money and energy, Works$56.99 · 6.8/10Top buyer rating (50+ reviews)
Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star$79.99 · 7.6/10Start with fit, then weigh the recorded benefit against the limitation. These are review assessments of the top three listings, not measured advantages over every alternative.
Recorded intended fit: Homes needing targeted multi-room temperature monitoring
Why consider it
Bundled remote sensor manages localized hot or cold spots
What could change your decision
Premium price point relative to basic connected thermostats
Recorded intended fit: DIY installers wanting a familiar thermostat design
Why consider it
Familiar push-button hardware interface
What could change your decision
Outdated aesthetic compared to modern thermostats
Recorded intended fit: Basic Google ecosystem climate automation
Why consider it
Lower price than other color variants
What could change your decision
Middling 4.1 user rating
| Specification | ecobee Smart Thermostat Premium - WiFi, Siri & Alexa | Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star | Google Nest Thermostat - Smart Thermostat for Home | Amazon Smart Thermostat, Save money and energy, Works |
|---|---|---|---|---|
| Recorded price | $209.99 | $79.99 | $117.45 | $56.99 |
| Review trade-off | Premium price point relative to basic connected thermostats | Outdated aesthetic compared to modern thermostats | Middling 4.1 user rating | Strict C-wire requirement |
| Connectivity Technology | Bluetooth | Wi-Fi | Wi-Fi | Not recorded |
| Power Source | Corded Electric | Battery or C-wire | Battery Powered | Not recorded |
| Voltage | 24 volts | 24 volts_of_alternating_current | 24 volts | Not recorded |
| Connectivity Protocol | Wi-Fi | Not recorded | Wi-Fi | Not recorded |
| Original listing | Amazon · B09XXS48P8 | Amazon · B01NB1OB0I | Amazon · B08HRPDYTP | Amazon · B08J4C8871 |
Values are shown as recorded, without unit conversions or inferred compatibility. Not recorded means unknown, not absent. Prices are snapshots, not current offers. Editorial scores are research judgments, not lab results. Amazon links are affiliate links.
Before treating a comparison as complete
A specification appearing in a listing is not independent verification. These counts show which shortlisted records contain the same field; a blank record does not mean the product lacks the feature.
Connectivity Technology
Recorded for 3 of 4 shortlisted models
Power Source
Recorded for 3 of 4 shortlisted models
Voltage
Recorded for 3 of 4 shortlisted models
Connectivity Protocol
Recorded for 2 of 4 shortlisted models
Dimensions
Recorded for 1 of 4 shortlisted models
Screen Size
Recorded for 1 of 4 shortlisted models
Your shortlist
All 5 title-confirmed models, in editorial ranking order. Specification values are copied from their review records, not independently measured. With a price limit set, models without a recorded price are excluded.
5 of 5 models · 0/2 selected
Rank 1 · $209.99 · 8.2/10
Connectivity Technology
Bluetooth
Review limitation: Premium price point relative to basic connected thermostats
Rank 2 · $79.99 · 7.6/10
Connectivity Technology
Wi-Fi
Review limitation: Outdated aesthetic compared to modern thermostats
Rank 3 · $117.45 · 7.4/10
Connectivity Technology
Wi-Fi
Review limitation: Middling 4.1 user rating
Rank 4 · $56.99 · 6.8/10
Connectivity Technology
Not recorded — confirm the exact model before buying.
Review limitation: Strict C-wire requirement
Rank 5 · $109.99 · 6.5/10
Connectivity Technology
Not recorded — confirm the exact model before buying.
Review limitation: Requires C-wire at both locations
Prices are snapshots. Check exact variants and units; differently named fields may describe the same specification.
No. 01 — Homes needing targeted multi-room temperature monitoring
The ecobee Smart Thermostat Premium sits at the higher end of the category, combining an external remote sensor with onboard Siri and Alexa access. While HomeKit compatibility offers a degree of local command, broader operation remains tied to standard Wi-Fi and manufacturer cloud services rather than emerging local standards like Thread. Buyers should confirm HVAC wire compatibility before purchase and decide whether integrated microphones belong on their wall.
No. 02 — DIY installers wanting a familiar thermostat design
The Sensi ST55 keeps a traditional thermostat form factor while adding Wi-Fi control and Alexa support for $79.99. It earns a reliable 4.4 rating, often praised for straightforward DIY installation compared to modern puck-style designs. The classic display is utilitarian, avoiding touchscreens in favor of physical buttons.
No. 03 — Basic Google ecosystem climate automation
Functionally identical to the Charcoal model, this unit offers the same app-based control at a slightly lower $117.45 price point. It lacks advanced sensor expansion found on higher-tier models and relies heavily on cloud infrastructure. HVAC wiring compatibility must be confirmed prior to purchase.
No. 04 — Alexa-centric homes with verified C-wire setups
At $56.99, this is one of the most affordable smart thermostats on the market, built to integrate closely with Alexa and Ring. It explicitly requires a C-wire, meaning older homes without one will face additional adapter costs or complex wiring. The 4.0 rating reflects setup friction and dependence on Amazon's ecosystem.
No. 05 — Multi-zone homes fully committed to Alexa
This dual-pack lowers the per-unit cost marginally for multi-zone households committed to Alexa. Both units mandate a dedicated C-wire connection at each terminal location. Ecosystem flexibility is narrow, making it ill-suited for Apple Home or local-first platforms.
This page summarizes our research reviews of Amazon listings, listed specifications and captured buyer ratings. It is not a hands-on test. Scores are editorial assessments, not measured performance; prices are recorded snapshots and may change. A category can include both main products and accessories, so its overall price range is not the cost of a complete setup.
Most recent product record update: October 3, 2026. Individual records may be older; this is not a verification date for every claim.
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