Black Friday 2026: The Smart Thermostats Worth Watching
A smart thermostat only pays off if it works with your heating system. Before you look at any deal, check what you have (a boiler, a heat pump, hot-water radiators) and, for a heat pump, how it's controlled: an on/off contact or OpenTherm.
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The models worth watching
Models taken from our buying guides. We don't show prices: check the current offer on Amazon.
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Best for heat pumps
tado Heat Pump Optimizer X
It connects to the heat pump itself (Daikin, Atlantic, Vaillant, Saunier Duval, Fujitsu, Panasonic) and adjusts its output to room temperatures.
From our guide: Best Smart Thermostats for Heat Pumps (2026): Buying Guide
Photo: © tado
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Best value
Netatmo Thermostat Original
Easy to install, works with most on/off air-to-water heat pumps, with Auto-Adapt, Eco-Assist and Matter via the Thermo Hub.
From our guide: Best Smart Thermostats for Heat Pumps (2026): Buying Guide
Photo: © Netatmo
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Best for OpenTherm without a hub
Honeywell Home T6
Compatible with on/off and OpenTherm systems, including heat pumps, it connects straight to Wi-Fi and is controlled from the Resideo app.
From our guide: Best Smart Thermostats for Heat Pumps (2026): Buying Guide
Photo: © Resideo / Honeywell Home
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Best for hot-water radiators, room by room
tado Smart Radiator Thermostat X Starter Kit
It goes after heating, the biggest energy user in the home: room-by-room control, Thread and Matter through the Bridge X, and tool-free installation.
From our guide: Smart Home Energy Savings Guide 2026: Where Automation Really Pays Off
Photo: © tado
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Keep reading
Amazon's Black Friday page
Every current offer, updated as the event unfolds. Amazon usually opens its deals about a week before Black Friday.
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Frequently asked questions
A thermostat controls the boiler or heat pump for the whole home. Smart radiator valves fit on hot-water radiators and set each room separately; you can combine the two.
Yes, if it matches how the heat pump is controlled: on/off for most, OpenTherm for some. The tado Heat Pump Optimizer X connects directly to several heat pump brands.
Smart radiator valves go on most radiators without tools. A wired thermostat replaces your old one; if you're unsure about the boiler or heat pump wiring, call in an HVAC technician.