The short version: The Daikin One+ is Daikin’s flagship smart thermostat, built for bi-directional communication with Daikin HVAC equipment and expandable with a separate air quality monitor accessory. It’s sold through Daikin’s dealer network rather than retail, so independent owner reviews are scarce. This review is built on manufacturer specs and the limited independent coverage that exists, not a large body of verified buyer feedback.

A note on sourcing: This is a dealer-installed, contractor-channel product. Independent reviews are thin — what we found was largely manufacturer materials and brief tech-press coverage of the product launch, not hands-on long-term reviews. Ask your installer for recent customer references before buying.

Who It’s For

The One+ is built for forced-air homes, and it’s designed to get the most value when paired with a Daikin communicating HVAC system — bi-directional communication lets the thermostat and equipment share real-time operating data for more precise control than a standard on/off signal. It also functions as a standard smart thermostat on non-Daikin systems, just without the deeper integration.

Design & Build and Compatibility

The One+ uses a capacitive touchscreen with over-the-air software updates. Installation and full commissioning are typically handled by a Daikin-certified dealer, particularly when paired with communicating equipment. Confirm your system’s compatibility and wiring requirements with your installer before assuming full feature support.

Standout Feature: Indoor Air Quality Monitoring

The One+ can display indoor air quality data — including particulate matter and VOC readings — when paired with the separately-sold Daikin One Home Air Monitor accessory. Without that add-on, the base thermostat doesn’t include onboard air quality sensing. If air quality monitoring is the reason you’re considering this thermostat, confirm the accessory is included in your quote, since it’s not bundled by default.

App & Ecosystem

The Daikin app supports Amazon Alexa and Google Assistant for voice control and remote access. Confirm current Apple HomeKit or Matter support directly with your installer or Daikin’s current spec sheet, since dealer-channel ecosystem support can change between model years with limited public documentation.

Price & Value

Daikin One+
Price (USD) $280–$400 (installed pricing varies by dealer; air quality monitor sold separately)
Where sold Daikin dealer network
Subscription required No

Get an itemized quote that separates the thermostat, any air quality monitor accessory, and installation/commissioning labor, especially if you’re pairing it with communicating equipment.

Pros & Cons

Pros:
– Bi-directional communication with compatible Daikin equipment for more precise control
– Expandable indoor air quality monitoring via a separate accessory
– Alexa and Google Assistant support
– Over-the-air software updates

Cons:
– Requires a dealer visit — no retail DIY purchase path for most buyers
– Air quality monitoring requires a separate accessory purchase, not included by default
– Very limited independent review coverage to verify long-term reliability
– Full feature set depends on Daikin communicating equipment

Daikin One+ compared against other dealer-installed manufacturer thermostats

The Recommendation

Consider the Daikin One+ if your installer is already quoting Daikin equipment and you want the deeper bi-directional integration, or you specifically want the expandable air quality monitoring. Ask for recent customer references, since independent reviews are thin.

Consider alternatives if you want a thermostat you can research thoroughly before buying — retail options like ecobee or Nest have far more independent owner feedback available.

Frequently Asked Questions

Does the Daikin One+ include air quality monitoring out of the box?
No. Air quality sensing requires the separately-sold Daikin One Home Air Monitor accessory. The base thermostat doesn’t include onboard air quality sensors.

Can I buy a Daikin One+ without a Daikin HVAC system?
It works as a standard smart thermostat on non-Daikin systems, but you lose the bi-directional communication that’s the product’s main differentiator. It’s sold through Daikin’s dealer network, not retail.

Why is there so little independent review coverage of the Daikin One+?
It’s a contractor-channel product rather than a retail or Amazon-marketplace item, so it doesn’t accumulate the same public review volume as thermostats sold directly to consumers. Ask your installer for references instead.