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Honeywell YTH9421C1002

VisionPro IAQ Programmable Thermostat, Four Stage Heat Two Stage Cool (Touchscreen)

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Control comfort and Indoor Air Quality (IAQ) throughout your entire home with Honeywell's VisionPRO IAQ Total Home Comfort System. VisionPRO IAQ eliminates the need for multiple controls in your living space, by managing your home's temperature, humidification, dehumidification, ventilation and air filtration - all from a single, effortless touchscreen control. The VisionPRO® IAQ Total Home Comfort System features an effortless, 7-Day programmable touchscreen thermostat that provides control of temperature, humidification, dehumidification, and ventilation.

Standard Features

  • Contains all features of standard VisionPRO, except arm chair programming
  • Thermostat connects with Equipment Interface Module or EnviraZone panel to control temperature, humidification, dehumidification and ventilation from a single point in the home.
  • Automatically raises humidity levels throughout all rooms in the home, moisturizing air to prevent symptoms of dryness and to protect hardwood flooring and woodwork
  • Automatically lowers humidity levels through all rooms in the home, utilizing air conditioning or a whole house dehumidifier to prevent dampness, stickiness or odors; symptoms often associated with air that is too moist
  • Removes air pollutants by exchanging the stale air in a house with fresh, filtered air better than having an open window

Manual/Digital

Manual - Conventional dial or lever style of mechanical thermostat. It doesn’t have many features.
Digital - This has a display screen and is often capable of a variety of useful functions.

Manual/Digital
Digital
Stages of Heat

The number of terminals on the thermostat that can be used to individually control separate heating functions. Many furnaces that are called two stage heaters will require at least a two stage thermostat to operate appropriately. You may also choose a multiple stage thermostat when pairing different heating equipment. Such as a heat pump and a furnace.

Stages of Heat
4 w/ Heat Pump
Stages of Cool

The number of terminals on the thermostat that can be used to individually control separate cooling functions. Some of the higher efficiency air conditioners and heat pumps are designed to use multiple stages of cooling.

Stages of Cool
2
Programming Days

The number days per week that the thermostat will be able to individually program. Ex. a 5,1,1 programmable thermostat will have the same program settings on Monday-Friday and will be able to individualize the programming on Saturday and Sunday. A 7 day programmable thermostat will be able to set a different programming schedule for each day of the week.

Programming Days
7
Use with Heat Pump

Indicates that this thermostat is compatible with heat pumps.

Use with Heat Pump
Yes
Power Method

Indicates if the thermostat operates electrically on batteries or power from the furnace/air handler.

Power Method
Power Stealing
Millivolt

A "2-wire Millivolt" system. These are usually gas-fired wall or floor heaters that do not have forced-air blowers. In other words, they are convection heaters.

Millivolt
No
Use with Gas/Oil

Indicates that this thermostat can be used with either a gas furnace or oil furnace.

Use with Gas/Oil
Yes
Use with Electric Furnace

Indicates that this thermostat is compatible with electric furnaces or air handlers with electric heater coils. The voltage to the thermostat will be the normal 24 VAC. This feature is different from a "Line Voltage Capable" thermostat which operates with 120 to 240 VAC.

Use with Electric Furnace
Yes
Programmable Fan

Allows for you to establish by schedule when you want your furnace/air handler fan to turn on and off automatically to circulate home air, even without your furnace or air conditioner operating.

Programmable Fan
Yes
Dual-Fuel Compatible
Yes
Resume / Adaptive Intelligent Recovery Capability

Brings the room temperature back to the programmed temperature at the set time, even when you may have manually over-ridden the program in the interim which will maximize comfort and energy savings.

Resume / Adaptive Intelligent Recovery Capability
Yes
Backlit Display

Allows easier viewing of disply screen in the dark.

Backlit Display
Yes
Outdoor Temperature Sensor Capability

When used with an outdoor air sensor, this features allows the thermostat to sense the outdoor temperature and indicate such on the screen. Also allows some thermostats to automatically decide whether to heat or cool the home based on outside temperatures.

Outdoor Temperature Sensor Capability
Yes
Indoor Temperature Sensing Capability

Some thermostats provide for wiring to an accessory called an indoor sensor. The indoor sensor mounts in the home living space away from the thermostat, and tells the thermostat what the temperature is in that area. The thermostat will then use the temperature from the sensor to indicate the home's current comfort level, instead of just the temperature near the thermostat.

Indoor Temperature Sensing Capability
Yes
Ventilation Control/Independent Circuit Switching

This feature allow a user to control from the thermostat any other electronic device such as an independent fan.

Ventilation Control/Independent Circuit Switching
Yes
Auto Changeover

This feature allows the thermostat to automatically switch from heating to cooling based on the temperature inside. This is useful between seasons when heating may be needed at night, and cooling during the day.

Auto Changeover
Yes
Memory Back-Up

Having this feature will store your set temperature or temperature schedule. In the event of a power failure, you won't have to reprogram the thermostat when the power returns.

Memory Back-Up
Yes
Filter Indication

Reminds you that it's time to change your furnace or air handler filter.

Filter Indication
Yes
Humidifier Panel Indication

Reminds you that it's time to change your humidifier pad, which is normally done so annually.

Humidifier Panel Indication
Yes
Humidity Control

Allows you to control your whole-house humidifier from your thermostat.

Humidity Control
Yes
Vacation Hold

Allows you to program your thermostat to operate your heating/cooling system at a minimum when you leave on vacation (to save money), and then automatically return the temperature to a normal comfort setting just before you arrive home. Having this capability will mean that when you return, your house will be nice and comfortable.

Vacation Hold
Yes
Keypad Lockout

Indicates that you may select to allow only individuals who have a numeric code (which you create) to change the temperature or settings on the thermostat. This feature is useful for thermostats located in public spaces, or to keep children from operating the thermostat.

Keypad Lockout
Yes
Color
White
Width
6 Inches
Depth
1 3/8 Inches
Height
4 9/16 Inches
Limited Warranty
5 Years

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.