Honeywell's Wi-Fi smart thermostat falls to $80 at Amazon

Honeywell's Home Wi-Fi Smart Color Thermostat is on sale for $80 at Amazon, according to a Slickdeals listing. The device, model RTH9585WF1004, is sold and shipped by Amazon, with a list price of $179.99. Slickdeals says the price is the lowest recorded on Keepa, a price-tracking service. How-To Geek reports the same $80 price and describes it as a saving of 55 percent, which is close to the gap between the list price and the sale price.

The thermostat is a 7-day programmable model with a customizable color touchscreen. It connects to Amazon Alexa, Google Home and SmartThings, and it supports IFTTT for custom automations between devices. The screen shows a daily weather forecast and indoor and outdoor humidity. It carries Energy Star certification under the Certified Smart Thermostats v1.0 specification, and the Energy Star listing notes time-of-day usage and humidity sensing.

Two limits are noted before buying. The unit has no outdoor weather sensor, which How-To Geek considers a minor point for indoor use. More important, the model needs a C-wire, a common wire that many older heating and cooling systems lack. Buyers should check behind their current thermostat before ordering. How-To Geek calls the $80 price in line with budget thermostats.

Neither source says how long the price will last or whether other retailers will match it. The sources also do not state how the 55 percent figure was calculated.