Clear answers.


From simply adjusting the temperature to scheduling an upcoming vacation, you can find all the answers to your GLAS® questions here.


What is a C-wire?

A C-wire is a wire in your HVAC system that provides power to your thermostat.

If you do not have a C-wire, don’t worry. Use the included adapter and the installation instructions to convert your 4-wire system to a 5-wire system to power your GLAS thermostat.

Note: Double-check your current wiring for a C-wire as wires can sometimes be hidden in the wall.

Do I need the included adapter?

If you do not have a C-wire, you will need the adapter to power your GLAS thermostat.

Note: Double-check your current wiring for a C-wire as wires can sometimes be hidden in the wall.

What comes in the box?

In your GLAS box, you should find:

1. GLAS Thermostat

2. Optional backplate

3. Optional 4 to 5 wire adapter

4. (2) 1.5-inch Screws

5. (2) 1-inch Screws

6. (4) Drywall anchors

Where can I find GLAS’ warranty information?

To view GLAS’ warranty information, click here.

Energy Savings

How do I get energy savings reporting?

Tracking your energy savings is a great way to view your current usage and find ways to improve energy conservation.

To view your energy savings, swipe right from the home screen and select the energy savings button.

What information can I find in energy savings?

GLAS calculates energy savings by using an integrated learning model of your HVAC system. By connecting to Wi-Fi and entering your zip code, GLAS can identify a thermal model of your HVAC system after a few days of run time. Utilizing this information along with weather data coming from the cloud, GLAS will begin to calculate how much energy you would have used with a non-programmable thermostat.

You’re able to view your energy savings history up to 7 days and the reporting will update in real time to reflect the current day.

How can I improve my energy savings?

There are a few things you can do to improve your energy savings.

By creating schedules, activating occupancy detection, and selecting set points for home, away and sleep modes, you can ensure that the thermostat runs only when you need it.

To set your temperature preferences for home, away, and sleep, go to Settings>Comfort Settings>Temperature Preferences.

To set schedules and events, swipe left from the home screen and select Schedule. Follow the prompts to set up your schedule.

To ensure occupancy detection is activated, go to Settings>Comfort Settings>Scheduling Preferences.

Why should I take advantage of energy savings?

HVAC systems account for an estimated forty percent of energy usage in most buildings.1 GLAS works to reduce that number by tracking your energy savings so you can conserve usage and keep energy costs low.

Connecting to Wi-Fi

Will GLAS connect to my router?

GLAS requires a 2.4 GHz router for connection and operation compatible with 802.11 b/g/n networks.

Mobile hotspots and guest networks are not recommended.

Enterprise networks and captive portals are not supported at this time.

How do I connect to Wi-Fi?

Connection to Wi-Fi is part of the set-up process you will walk through during installation.

If you would like to make any updates to your Wi-Fi connection, go to Settings>General>Wi-Fi. Use the list provided to select the new network you wish to connect to and enter the password.

If the network you would like to use is not shown in the list, scroll to the bottom of the screen and select “Other”. Type in the name and password of the network you wish to connect to. The new network will be added to the network list.

How do I disconnect from Wi-Fi?

To disconnect from a Wi-Fi network go to Settings>General>Wi-Fi and select the “i” icon beside the connected network’s name. Select “Forget Network” and your system will disconnect.

If you have entered passwords for other networks, your system will automatically connect to them. If you would like to completely disconnect from Wi-Fi, repeat the process for all connected routers.

Why should I connect to Wi-Fi?

Connection to Wi-Fi allows you to get the most out of your GLAS thermostat.

Wi-Fi connection tracks the outdoor weather in your area to help you choose the most efficient temperature settings. Outdoor weather tracking also allows the thermostat to calculate your energy savings to improve your energy usage.

Using Wi-Fi also allows you to access your thermostat remotely from the web or your mobile device. With remote access, you can control your building’s temperature, adjust schedules, view energy savings, and power your system on or off.

Creating a User Account

Why should I create a user account?

Creating a GLAS user account gives you the ability to access your thermostat from anywhere. Using the web or mobile app, you can adjust your setpoints, edit schedules, view air quality, and change your temperatures.

Do I need a user account?

A user account is not required for GLAS, but without it you will be unable to access great features like remote access, simple control of multiple devices, and extended energy savings reports.

If I already have a Microsoft Account, can I use it?

To remotely access your GLAS device, control multiple locations, and take advantage of advanced reporting features, you will need to create a GLAS account. Your Microsoft Account will be necessary in order to take advantage of Cortana on your device to control GLAS and other smart home devices that work with Cortana. Don’t have a Microsoft Account? Don’t worry, you can easily create one on device while you set up Cortana.

Air Quality

Where do I find air quality?

To access air quality information, swipe left from the home screen and select air quality.

In air quality, you will find reporting on tVOCs, eCO2, and Humidity. When connected to Wi-Fi, you will also be provided with reporting on outdoor allergens, the Air Quality Index (AQI), and UV Index.

What does air quality measure?

Air quality monitors your indoor and outdoor air quality. Total Volatile Organic Compounds (tVOC), Equivalent Carbon Dioxide (eCO2), and Humidity are measured inside your home. When you are connected to Wi-Fi, the outdoor allergens, Air Quality Index (AQI), and UV Index in your area are also measured.

How can I find out more information about my current air quality?

To access air quality, swipe left from the home screen and select air quality, you will be directed to indoor air quality. By tapping on VOC, CO2, or RH, you can get more detail of each. By swiping to the left you will see the outdoor air quality where you can also tap to get more detail for allergens and smog.

What are tVOCs and why are they important?

Total Volatile Organic Compounds (tVOC) include a wide range of natural organic chemical compounds, such as carbon monoxide, methane, and benzene. Unhealthy levels of these chemicals can have respiratory, allergic, or immune effects both indoors and outdoors.2

Why is air quality important?

Air quality is important for maintaining personal and home health. Pollutants and allergens can cause respiratory and immune irritation. Unhealthy levels of these chemicals can have both short-term and long-term effects. Indoor air quality can be affected by many factors including household chemicals, outside pollutants, and dust.3,4

By being aware of your current air quality and taking steps to improve it, you can prevent adverse health effects and keep your home safe and healthy.

What is humidity and why is it important?

Humidity is the amount of water vapor in your air. Proper levels of humidity are important for maintaining personal and home health. Extremely high or low levels of humidity can cause damage to your building fixtures, such as hardwood floors, and discomfort for occupants.
When connected to Wi-Fi, GLAS will recommend the optimal humidity for the current outdoor temperature, and work to keep your home at those target levels if you have an auxiliary device that can impact humidity such as a humidifier, dehumidifier, or ventilator.

What are allergens and why are they important?

High levels of outdoor allergens, such as pollen and mold, can cause sneezing, itchiness, and runny nose or eyes.

What is Air Quality Index (AQI) and why is it important?

Air Quality Index (AQI) is a measurement designed to inform you of the current air pollution outside of your building. When the AQI is high, respiratory and immune complications may occur.4

Temperature Preferences

What are the temperature setpoints?

The Heat or Cool setpoint is the temperature the room has to reach before the heating or cooling will turn off.

What are home, away, and sleep temperature preferences and how do you set them?

To set your temperature preferences for home, away, and sleep, go to Settings>Comfort Settings>Temperature Preferences.

There you can select your desired heating and cooling temperature for each of the three modes.

Sleep mode is the temperature settings you select for your waking and sleeping hours. Your regular hours can be added to your GLAS thermostat so it will automatically adjust to your schedule and repeat daily.

Home and away are the temperature setpoints you select to maintain comfort while you’re home and save energy while you’re away.

How do temperature preferences benefit my space?

Temperature preferences conserve your energy by allowing you to adjust the space based on need and comfort level. As the environment changes, your system will respond to what you need.
By adjusting these setpoints, GLAS will ensure you’re comfortable at all times. In the summer, the higher you set your away and sleep setpoints, the more energy your GLAS can save you. And in the winter, the lower you set your away and sleep setpoints, the more energy your GLAS can save you.

What are emergency heating and cooling setpoints?

Emergency heating and cooling are setpoints designed to protect your building from freezing or overheating. These setpoints will power on the system to protect your home, regardless of schedule or operating mode.

What is off mode?

To put your system into off mode, swipe left from the home screen and select off.

When you place your system in off mode it will not run, regardless of schedule or occupancy.

In off mode, you can manually activate the fan. However, hourly runtime tracking and air quality control will not activate.

Heat protection and freeze protection will still activate in off mode in the event that the emergency heating or cooling setpoint is reached.


How do I create a schedule?

From the home screen, swipe left to access quick view and select schedule.

Your device will assist you in setting up your wake and sleep times, and creating events.

How do I create an event?

1. Select the “plus sign” in the upper right corner of the calendar view.

2. An away event allows you to place an event with your preselected away set points for a specified start and end time.

3. After adding the event, it will appear on your schedule.

I received an error when trying to schedule two events at the same time.

Scheduled events cannot overlap because the thermostat is only able to respond to one event at a time. If you would like to change the temperature in your space at a scheduled time, you can edit your existing event or delete the event and replace it with a new one.

How do I edit temperature preferences?

To edit your temperature preferences, go to Settings>Comfort Preferences>Temperature Settings and select the temperature setting you would like to adjust. You can edit your preferences for Home, Away, and Sleep.



1. United States Energy Information Administration, “Electricity Explained – Use of Electricity”

2. United States Environmental Protection Agency, “Volatile Organic Compounds’ Impact on Indoor Air Quality”

3. United States Environmental Protection Agency, “Introduction to Air Quality”

4. United States Environmental Protection Agency, “Air Quality Index (AQI) Basics”