ColorTouch T7850
Temperature, Wi-Fi, scheduling. No humidity control.
- Up to 4 heat and 2 cool stages
- Heat pump, dual fuel, gas or electric
- One wired sensor input (SENSOR)
VenstarVenstar · ColorTouchThe Venstar space at AirGreenThe ColorTouch T7850 and T7900 thermostats, sold and installed by AirGreen in Montréal, Laval, Longueuil, the South Shore and the North Shore.
The Venstar warrantyBusiness hours: Mon. to Thu. 8 a.m. to 6 p.m., Fri. 8 a.m. to 4 p.m.
Venstar ColorTouch · Updated October 20, 2026
Venstar ColorTouch: T7850 or T7900, one line sets them apart
Same colour screen, same built-in Wi-Fi, up to 4 heat and 2 cool stages on 24 V. In Venstar’s own chart, the T7900 adds one thing: humidity control.
Venstar’s own chart
18 rows, one difference
FeatureT7850T7900
Up to 4 heat and 2 cool stages
Gas, electric or heat pump control
Dual fuel capable
Simple or advanced operation, your choice
Switchable programmable or non-programmable
Adjustable timers and deadbands
Setpoint limiting
Programmable fan
Accepts a remote or outdoor sensor
English, Spanish or French on screen
Customizable screensaver and wallpaper
Equipment fault (FDD) notification
Wi-Fi built in, free mobile apps
Current weather and forecast screen
Title 24 compliant (California)
API for third-party monitoring and control
Controls humidification, dehumidification and reheat
Text messages sent to the thermostat screen (app or SkyWeb)
Source: venstar.com, residential ColorTouch chart, read Oct. 20, 2026.
4 + 2heat / cool stages
R + Cwires required, 24 VAC
Wi-Fibuilt into both models
1 yearVenstar warranty, parts
AirGreen × VenstarColorTouch T7850 and T7900Up to 4 heat and 2 cool stagesBuilt-in Wi-FiR and C wires requiredHumidity: T7900Montréal · Laval · Longueuil · South Shore · North Shore
01 · Which model
One question decides: humidity
Everything else is the same. Tell us what the thermostat should control on top of heating and cooling.
On top of temperature, I want to control…
Only the T7900 controls humidity. The rest of the chart is the same.
Our reading of Venstar’s chart
ColorTouch T7850
The full ColorTouch, without humidity control.
- The 17 shared rows of the chart: stages, dual fuel, Wi-Fi, API, weather.
- If a humidifier is added later, the T7900 will be needed.
02 · Terminals
Nine terminals, one of them with three possible uses
Describe your system: the planner puts each function on the terminal Venstar’s manual gives, and refuses what does not fit.
System
Heat stages
Cool stages
Compressors (heating and cooling)
Electric backup stages
Humidity
C wire behind the current thermostat
Terminal plan
The ColorTouch takes this setup
R24 VAC
C24 V common
GFan
Y1Compressor 1
Y2Free
W1/O/BO/B reversing valve
W2Backup 1
W3/AUXFree
SENSORFree
2heat1cool6wires at the thermostat
- Model: ColorTouch T7850, no humidity control requested.
- Electric backup: Venstar allows up to 2 backup stages while the heat pump is heating.
Based on the T7900 manual (P/N 88-1088, 04/15): W1/O/B, W2 and W3 for stages 1 to 3 of conventional heat; Y1 and Y2 for compressors; W2 and W3 for heat pump backup; W3/AUX set to heating, humidification or dehumidification. Venstar’s diagrams show no 4th conventional stage: quoted case by case.
AirGreen × Venstar
Venstar’s thermostat, a local installation.
Venstar designs the ColorTouch and publishes its wiring rules. AirGreen helps you pick the model that follows them, on quotation. Each does what it does best.
Venstar
What Venstar brings
- Thermostats since 1992California maker; owned by Daikin Comfort Technologies North America since 2022.
- The ColorTouchColour screen, built-in Wi-Fi, Skyport and a local API.
- The wiring rulesT7850 and T7900 manuals: R and C wires, single-use W3/AUX output.
- Manufacturer warrantyOne year from installation, parts only, per the manuals.
What AirGreen brings
- Sold and installed by AirGreenBoth ColorTouch models in our store, in Montréal, Laval, Longueuil, the South Shore and the North Shore.
- Venstar’s rules, appliedThe planner follows the manual and says “on quotation” where it is silent.
- Free estimateWe look at your system before picking the thermostat.
- RBQ 5645-9605-01Subclasses 15.8, 15.10 and 16.
The result: a ColorTouch picked for your system, price on quotation.
03 · Both ColorTouch models
Two thermostats, the same base
Colour touch screen (4.3 in. per the T7850 submittal), 5.25 × 4 × 1.1 in. housing, built-in Wi-Fi. Venstar’s manuals present both as residential models.
ColorTouch T7900
Everything in the T7850, plus humidity control through the W3/AUX output.
- Humidification 0 to 60%, dehumidification 25 to 99%
- A/C that dehumidifies: up to 20 °F (about 11 °C) below setpoint
- Reheat with electric backup heat
Sensors and accessories Venstar pairs with the ColorTouch
ACC-TSEN10K wired sensor, indoor or outdoor
ACC-TSENWIFIWi-Fi temperature sensor
ACC-TSENWBRemote sensor with override button
ACC-DSEN · ACC0425Duct sensors
ACC0410Add-A-Wire, when a wire is missing
ACC-WPLWHColorTouch wall plate
One wired SENSOR input: remote, averaged with the thermostat, outdoor, supply air or return air (T7850 and T7900 manuals). Accessories: venstar.com, read Oct. 20, 2026.
04 · Day to day
Four periods a day, set on the screen or in the app
Morning, day, evening, night: a heating and cooling setpoint per period, day by day or by group of days. Or no schedule at all: your choice.
Skyport
Free mobile app and SkyWeb site: setpoints, schedules, alerts.
Voice
Amazon Alexa and Google Home, according to Venstar.
Local API
For home automation on the home network.
Reminders
Filter, UV lamp, service call; humidifier pad on the T7900.
Lockout
Passcode screen lock and setpoint limits.
Vacation
Vacation mode and Away button; daylight saving preset, synced through Skyport.
AirGreen × VenstarVenstar warranty: 1 year, parts24 V thermostatsSkyport, Alexa, Google HomePrice on quotationMontréal · Laval · Longueuil · South Shore · North Shore
05 · Warranty and rebates
One year on parts, no rebate found as of October 20, 2026
What Venstar’s documents and the programs themselves say, as of October 20, 2026.
1 year
Venstar warranty, from the original installation
- Defective parts replaced, new or remanufactured
- Labour and shipping excluded
- Void if the unit is reinstalled elsewhere
- No registration asked in the manuals
T7850 and T7900 manuals (04/15) and quick start guide (03/15).
ENERGY STARNot eligible
No Venstar on the certified smart thermostat list.
ÉnergirNot eligible
The rebate requires an ENERGY STAR thermostat on its PEE-104 and PEE-204 lists: Venstar is not there.
LogisVertNot eligible
Guide v1.10 covers heat pumps, not thermostats.
HiloNot eligible
Compatible devices: Honeywell Home, Mysa and Sinopé.
Venstar in brief. Thermostat maker founded in 1992 in California, more than 10 million thermostats installed across North America according to Venstar, owned by Daikin Comfort Technologies North America since December 2022. Sold through authorized distributors only; in Québec, Venstar’s map lists Trane Supply in Laval and Québec City.
06 · FAQ
Frequently asked questions about the ColorTouch
What is the difference between the T7850 and the T7900?
In Venstar’s ColorTouch chart, the two models share 17 of 18 rows. Only the T7900 controls humidification, dehumidification and reheat. The T7850 manual mentions a built-in humidity sensor, but Venstar’s sales sheet reserves the indoor humidity display for the T7900.
Does the ColorTouch work with electric baseboards?
No. Venstar’s quick start guide is clear: if the system is labelled 120 V or 240 V, or you see large thick wires and wire nuts, do not proceed. The ColorTouch is a 24 V thermostat for a furnace, central heat pump or central air conditioner.
Is a C wire required?
Yes. Venstar requires the R and C wires (24 VAC) on both models. If a wire is missing, the manual suggests a new cable or the Add-A-Wire accessory, except on a 2-wire heat-only system, where another wire must be pulled.
Can the ColorTouch run a heat pump with backup heat?
Yes: up to 2 compressors and 0 to 2 auxiliary stages, for a total of 4 heat stages. With electric backup, Venstar lets both auxiliary stages run while the heat pump is heating.
What about dual fuel, a heat pump with a gas furnace?
It is supported, for heat pumps only. The switch to the furnace follows the outdoor temperature, with an ACC-TSEN sensor on the SENSOR terminal, or, in Venstar’s 2-compressor diagram, a 3rd-stage demand. The balance point is set from 0 to 60 °F (about -18 to 16 °C).
Can the T7900 control a humidifier and a dehumidifier at the same time?
The T7900 has a single humidity output, W3/AUX, set to heating, humidification or dehumidification. A humidifier and a separate dehumidifier cannot share that output, and the manual does not show this setup: quoted case by case.
Is Wi-Fi included?
Yes, built into both models (2.4 GHz), with the free Skyport app and SkyWeb site. No module to add; in the same family, the T7800 is the one without Wi-Fi.
Can I control it by voice?
Venstar lists Amazon Alexa and Google Home for the ColorTouch, through the Skyport account.
How many sensors can I add?
The thermostat has one wired SENSOR input: remote, averaged with the thermostat, outdoor, supply air or return air. Venstar also offers a Wi-Fi sensor (ACC-TSENWIFI). The manuals give no maximum number of Wi-Fi sensors.
What is the warranty?
Venstar’s: one year from the original installation, parts only (new or remanufactured). Labour and shipping are excluded, and the warranty is void if the unit is reinstalled elsewhere.
Is there a rebate for this thermostat?
None found as of October 20, 2026. No Venstar is on the ENERGY STAR smart thermostat list, so there is no Énergir rebate, which requires it. LogisVert does not cover thermostats and Hilo does not list Venstar.
Is the screen in French?
Yes: English, Spanish or French, your choice, on both models.
Who is Venstar, and where is it sold in Québec?
Venstar is a thermostat maker founded in 1992 in California, owned by Daikin Comfort Technologies North America since December 2022. Venstar sells through authorized distributors; its map lists Trane Supply in Laval and Québec City.
No question matches. Write to us or call 514 316-2973.
AirGreen · Montréal, Laval, Longueuil, South Shore and North Shore
We look at your system first, then the thermostat
Free estimate, sale and installation of the Venstar ColorTouch T7850 and T7900 across Greater Montréal. Price on quotation.
Showroom1370 rue Joliot-Curie, unit 712, Boucherville
HoursMon. to Thu. 8 a.m. to 6 p.m. · Fri. 8 a.m. to 4 p.m.
RBQ 5645-9605-01Subclasses 15.8, 15.10 and 16
See alsoVENSTAR thermostat · All our thermostats
Sources checked on October 20, 2026
- Venstar — ColorTouch page and residential chart T7800 / T7850 / T7900 (venstar.com/thermostats/colortouch), read Oct. 20, 2026
- Venstar — T7850 manual, P/N 88-1087 Rev. 1, 04/15
- Venstar — T7900 manual, P/N 88-1088 Rev. 1, 04/15
- Venstar — ColorTouch quick start guide, P/N 88-1094 Rev. 1, 03/15
- Venstar — T7850 submittal (4.3 in. screen), undated
- Venstar — ColorTouch residential sales sheet, 88-1094 (02.17): dimensions, features
- Venstar — ColorTouch support, accessories and distribution note, read Oct. 20, 2026
- Venstar — About us and distributor map (venstar.com/company, venstar.com/buy), read Oct. 20, 2026
- Business Wire — Daikin Comfort Technologies North America acquires Venstar, Dec. 1, 2022
- ENERGY STAR — certified smart thermostats (data.energystar.gov, dataset 7p2p-wkbf), read Oct. 20, 2026
- Énergir — eligible devices PEE-104 and PEE-204, valid as of Oct. 1, 2026
- Hydro-Québec — LogisVert guide v1.10, Sept. 15, 2026; Hilo compatible devices, read Oct. 20, 2026
Venstar, ColorTouch and Skyport are Venstar trademarks. AirGreen sells and installs these thermostats; the warranty is the manufacturer’s.
Price on quotation · free estimate. Both ColorTouch models below.
The Venstar shop
Both ColorTouch models, right below.
T7850 or T7900: open the product page. Price on quotation.
