Black Friday 2026: the smart thermostats worth watching
A smart thermostat is only useful if it works with your heating system. Before you look at any deal, check what you have (furnace, boiler with hot-water radiators, heat pump) and, for a heat pump, how it's controlled: on/off contact or OpenTherm.
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The models worth watching
Models taken from our buying guides. We don't list prices, so 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: Smart Thermostat for a Heat Pump 2026: Guide and Best Models
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: Smart Thermostat for a Heat Pump 2026: Guide and Best Models
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: Smart Thermostat for a Heat Pump 2026: Guide and Best Models
Photo: © Resideo / Honeywell Home
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Best for radiators, room by room
tado Smart Radiator Thermostat X Starter Kit
It targets heating, usually the biggest energy user: room-by-room control, Thread and Matter via the Bridge X, tool-free installation.
From our guide: Smart Home Energy Savings Guide 2026: Where Automation Really Cuts Energy Use
Photo: © tado
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Learn more
Amazon's Black Friday page
Every current offer, updated as the event unfolds. Amazon usually opens its deals about a week before Black Friday.
See Black Friday deals on Amazon →As an Amazon Associate I earn from qualifying purchases.
Frequently asked questions
A thermostat controls the furnace, boiler or heat pump for the whole home. Smart radiator valves go 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 fit most radiators without tools, but check that your valve is compatible first. A wired thermostat replaces your old one; if you're unsure about the furnace, boiler or heat pump wiring, call in an HVAC technician.