Smart AC Control

Ecobee Smart Thermostat Premium

A smart thermostat bundling a remote room sensor, an air-quality sensor, and a built-in Alexa speaker — Wirecutter's stated top overall pick in the category, from a company with a real, well-documented history.

ENERGY STARRoom + Air-Quality SensorBuilt-in Alexa

Some sites attribute a "9.2/10 consensus" and a "449% 5-year ROI" figure to this product — those numbers come from an SEO-aggregator site, not a real, named source, so we don't repeat them here. What's independently verifiable: Wirecutter names this its top overall smart-thermostat pick, and ENERGY STAR publishes a program-level (not product-specific) estimate of $50–145/year in typical savings for smart thermostats generally.

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Why we recommend it

CompanyEcobee — founded 2007, Toronto; acquired by Generac (2021)

Independent pickWirecutter's stated top overall pick

CategoryOne of the original smart-thermostat companies

Recommended pick

If central AC or a mini-split is already in place, controlling it well is where the real savings are — this is the category leader for a reason that's independently checkable.

See it on Amazon → As an Amazon Associate, we earn from qualifying purchases.

What it actually is

A Wi-Fi thermostat that replaces a central AC/heating system's existing thermostat, adding a wireless remote sensor (so it can read the temperature in the room you're actually in, not just near the thermostat itself), an air-quality sensor, and a built-in Alexa voice assistant speaker in the box.

Real background, not marketing copy

A real, well-documented corporate history

Ecobee was founded in 2007 in Toronto, one of the original smart-thermostat companies (alongside/predating Nest). It was acquired by Generac Holdings — the publicly traded generator company — in a deal announced in November 2021, valued up to $770 million. That's a real, checkable acquisition, not an obscure ownership structure.

An independently-named top pick, not a fabricated score

Wirecutter's own stated reasoning is that no competitor bundles a room sensor, an air-quality sensor, and a built-in voice assistant at this price. We're citing that specific, real reasoning rather than the unsourced "9.2/10" and "449% ROI" numbers we found circulating on SEO aggregator sites, which we could not trace to any real source.

The ENERGY STAR savings estimate, correctly framed

This is a category estimate, not a promise about this exact product. ENERGY STAR — the U.S. government efficiency program, not Ecobee — publishes a general estimate that smart thermostats can save $50–$145 per year on heating/cooling costs for a typical household. That figure describes the smart-thermostat category as a whole, based on typical usage patterns; it isn't a confirmed or product-specific number for this exact model, and actual savings depend on your home, climate, and current setup.

Who this is (and isn't) right for

Good fit if...

You already have central heating/cooling (a forced-air HVAC system) and want a smart thermostat with room-level sensing to even out temperature differences between rooms.

Not the right pick if...

You're only using window or portable AC units. A smart thermostat needs a compatible existing central HVAC system to control — it isn't a standalone add-on for a window or portable unit.

FAQ

Do I need special wiring for this?

It needs to connect to a compatible central HVAC system's existing thermostat wiring. Compatibility depends on your specific system — worth checking against Ecobee's compatibility checker before buying if you're unsure.

Does it work with a window AC?

Generally, no. Smart thermostats like this are designed to control central, ducted HVAC systems — not standalone window or portable AC units, which don't have the wiring a thermostat like this connects to.

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