Daikin D4271C 4H/2C 7-Day Programmable Commercial Thermostat with Wi-Fi Capability

The Daikin D4271C is a Premium series commercial digital thermostat designed for light commercial and residential HVAC applications. Supporting up to 4 stages of heat and 2 stages of cooling (4H/2C), it is compatible with gas, electric, oil, forced air, variable speed, heat pump, and radiant heat systems operating on 24Vac.

The D4271C features a 7-day fully programmable schedule with independent programming for all seven days, including morning, day, evening, and night time periods. The thermostat can also be configured as non-programmable when needed. An optional Wi-Fi module enables connectivity to the Daikin Skyport™ Cloud Services, providing remote control and monitoring via iOS, Android, and desktop devices. A built-in local API also allows integration with popular home automation platforms, including Amazon Alexa.

Key Features:

• 4H/2C multi-stage control — supports gas/electric, dual-fuel, and heat pump systems
• 7-day independent programming with morning, day, evening, and night periods
• Optional Wi-Fi module for Daikin Skyport™ remote access via iOS, Android, and desktop
• Local API for home automation and smart home system integration
• Amazon Alexa compatible (with optional Wi-Fi module)
• OpenADR 2.0b compliant — eligible for utility demand response incentive programs
• California Title 24 compliant
• Scrolling backlit display with adjustable brightness — usable as a night light or fully disabled
• Multilingual display support: English, Spanish, and French
• Switchable manual or auto-changeover mode
• Outdoor sensor ready with condensate overflow sensor input
• Keypad lock to prevent unauthorized changes
• Service filter reminder and UV lamp replacement reminder
• Holiday mode with energy-saving unoccupied setpoints
• Emergency heat mode with aux heat indicator
• Dual temperature units (°F or °C)
• Firmware update capable via Wi-Fi

The D4271C is part of Daikin's Premium series commercial thermostat lineup and is also sold under the Venstar T4800 label. It delivers flexible, feature-rich climate control suitable for new construction, retrofit, and light commercial installations.