Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55
$99.99 is an ordinary price for this.
The middle price across the 23 days we have watched it, counting the days a limited-time deal was running, was $99.99. The lowest price it held was $98.98, $1.01 under today's — too little to wait for. It touched $79.99 on September 19 without holding it.
When the price here has fallen to $98.98 or below — 8 times in our record — it stayed there a median of 12 hours, and at most 45 hours.
This describes the prices we recorded. It is not a forecast of where this one goes next.
Price at AmazonVerified
Price history
One line: the best price any tracked retailer charged, per day.
Price set by a third-party seller, not the retailer itself
sales rank — the line rises as it sells moreShaded stretches are sales, from our calendar.
| Price | Now | Lowest | Highest | Usual | Average | Days recorded |
|---|---|---|---|---|---|---|
| New | $99.99 | $79.99 on Sep 19 | $110.00 on Sep 24 | $99.99 | $99.77 | 23 |
| Sold by Amazon | — | $79.99 on Sep 19 | $102.33 on Sep 25 | — | $93.42 | 22 |
| Third-party sellers | — | $94.90 on Sep 28 | $110.00 on Sep 24 | — | $102.95 | 23 |
Sales events
Next on the calendar: Black Friday, November 27. We keep checking this price through it and report here what it did.
What our record shows
- $5.01 more than the $94.98 it cost on October 9 — this price went up, not down.
- Cheaper than this on 30% of the 23 days we have watched it here.
Computed from our own checks at Amazon as of October 10. No line here uses a price a retailer told us about.
Where to buy
- Held for
- changed today
- Their 23-day low
- $79.99
- Checked
- 5h ago
Prices checked at least every 12 hours. “Held for” is how long that retailer has been charging this price. A hidden price is one we cannot re-confirm recently enough to publish.
We earn a commission on purchases. It never affects our rankings.
Tell me when it drops
A notification in this browser when the price falls. No email, no account, nothing to install.
A notification carries a button that stops that alert; blocking notifications for this site in your browser stops them all.
What it is
7 attributes, in the retailer’s own words. We record the prices; these we only pass on.
- Size
- No Size
- Color
- White
- Weight
- 0.85 pounds
- Dimensions
- 5.88 × 3.75 × 1 inches
- Model
- ST55
- Released
- May 2017
- Warranty
- 3 years.
Cheaper in Smart Home, and what changes
Things we track on the same shelf for at least 10% less than $99.99, with the attributes the retailers describe differently. Their words, not our judgement — we record prices, we do not test products.
SensiLite Smart Thermostat, WiFi, Alexa, DIY, Energy Star Certified, ST25$64.99 at Amazon $35.00 lessWeight: 0.3 pounds instead of 0.85 poundsDimensions: 5.07 × 3.13 × 0.88 inches instead of 5.88 × 3.75 × 1 inches
AmazonSmart Thermostat, Save money and energy, Works with Alexa and Ring, C-wire required$79.99 at Amazon $20.00 lessWeight: 0.24 pounds instead of 0.85 poundsDimensions: 3.56 × 3.56 × 0.84 inches instead of 5.88 × 3.75 × 1 inches
GoogleNest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Charcoal$85.49 at Amazon $14.50 lessWeight: 0.31 pounds instead of 0.85 poundsDimensions: 3.31 × 3.31 × 1.07 inches instead of 5.88 × 3.75 × 1 inches
Every change we recorded at Amazon
Every row is a price we saw change. We write one only when a price actually moves, so a gap here means the price held.
| When | Price | Change |
|---|---|---|
| · today | $99.99 | +$1.01 |
| · 1d ago | $98.98 | +$4.00 |
| · 1d ago | $94.98 | −$4.00 |
| · 2d ago | $98.98 | −$1.01 |
| · 3d ago | $99.99 | −$0.71 |
| · 3d ago | $100.70 | +$0.71 |
6 older changes
| When | Price | Change |
|---|---|---|
| · 4d ago | $99.99 | +$2.00 |
| · 4d ago | $97.99 | −$2.00 |
| · 6d ago | $99.99 | +$1.01 |
| · 7d ago | $98.98 | +$18.99 |
| · 7d ago | $79.99 | −$30.01 |
| · 8d ago | $110.00 | +$30.01 |
Others we track in Smart Home
See all Smart Home prices
Philips HueGo Smart Portable Table Lamp, 1-Pack, White$94.00 · low $74.791 retailer · 5 recorded prices
TapoSmart Wi-Fi Door Lock, Deadbolt, Fingerprint Recognition, DL110$108.531 retailer · 2 recorded prices
Philips HueSmart LED Candle Light Bulb, B39, E12, 2-Pack$109.991 retailer · 1 recorded price
ULTRALOQBolt SE Wi-Fi Smart Lock, Matter Over Thread, App Remote Access$89.99 · low $79.991 retailer · 10 recorded prices
KonnectedSmart Garage Door Opener blaQ - Works with Chamberlain/Liftmaster Security+ Openers - Local myQ Alternative - Alexa, SmartThings, Home Assistant, Hubitat, Control4, HomeSeer Integration$89.00 · low $71.201 retailer · 3 recorded prices
Philips HueSmart LED A19 Bulb, 3-Pack$89.00 · low $84.541 retailer · 6 recorded prices
$99.99
at Amazon · we earn a commission