WikiCompare live prices on thermostat across Amazon, eBay, Walmart, Target, Best Buy, AliExpress, and curated Awin partner merchants. Nest Learning Thermostat 4th gen ($280) — learns your schedule, integrates with Google Home, looks good. Ecobee Smart Thermostat Premium ($249) — better with remote room sensors (great for multi-story homes), works with HomeKit. Honeywell T9 ($199) — budget pick with sensor support. Energy savings are real but small (10-15% on heating bills) — the bigger value is remote control from your phone and seasonal scheduling. Make sure you have a C-wire (common wire) — if not, add a C-wire adapter or use the Ecobee power kit. Click any card to open the seller's product page; we earn a small affiliate commission at no extra cost to you.
Frequently asked questions about thermostat
Smart thermostat — which to buy?
Nest Learning Thermostat 4th gen ($280) — Wirecutter pick, learns schedule, integrates with Google Home. Ecobee Smart Thermostat Premium ($249) — better with remote room sensors (multi-story homes), works with HomeKit. Honeywell T9 ($199) — budget pick with sensor support. Most homes save 10-15% on heating bills.
Are smart thermostats worth the cost?
Yes for most homes. Save 10-15% on heating + cooling bills (~$130-180/year for average $1,300 annual HVAC bill). Pays for itself in 2-3 years. Remote control via phone + scheduling worth the cost even without savings. Especially valuable for: multi-zone homes, vacation properties, people with irregular schedules.
Do I need a C-wire for smart thermostat?
Yes — most smart thermostats require C-wire (common wire). If your old thermostat has only 4 wires + no C-wire, you need: 1) C-wire adapter (Venstar Add-A-Wire $25), 2) Power Extender Kit (some Ecobee models include this), 3) Run new C-wire (HVAC pro: $100-200). Most modern homes have C-wire.
Best thermostat for multi-story homes?
Ecobee Smart Thermostat Premium with Room Sensors ($249 + $80 per sensor). Sensors detect room occupancy + temperature. Average temperature across multiple sensors for more accurate whole-home heating/cooling. Nest doesn't support room sensors as elegantly — Ecobee wins for this use case.
What features do I actually need in a thermostat?
Scheduling (different temps for weekdays/weekends + sleep). Geofencing (auto-adjust based on phone location). Remote control via app. Smart home integration (Alexa, Google, HomeKit). Skip: humidity sensors (most homes don't optimize for this), motion sensors in single rooms (over-engineered).
How long do smart thermostats last?
Nest + Ecobee: 5-10 years before software/hardware bottlenecks. Replacement displays available from manufacturers. Sensors last 5+ years. Software updates remain for 5-7 years. Eventually outdated — but $250 over 7 years = $36/year, easily paid back by energy savings.