Get Started with Honeywell Resideo Thermostats
Learn how to connect and control your Honeywell Resideo devices with the Seam API.

Overview
Seam provides a universal API to connect and control many brands of devices such as smart locks, thermostats, and sensors. This guide provides a rapid introduction to connecting and controlling your Honeywell Resideo thermostats using the Seam API. To learn more about other brands of devices supported by Seam, head over to our integration page.
1. Install Seam SDK
Seam provides client libraries for many languages, such as JavaScript, Python, Ruby, PHP, and others, as well as a Postman collection and OpenAPI spec.
npm i seam
Once installed, sign-up for Seam to get your API key and export it as an environment variable:
$ export SEAM_API_KEY=seam_test2ZTo_0mEYQW2TvNDCxG5Atpj85Ffw
2. Link Honeywell Resideo Account with Seam
To control your Honeywell Resideo device using the Seam API, you must first authorize your Seam workspace against your Honeywell Resideo account. To do so, Seam provides Connect Webviews: pre-built UX flows that walk you through authorizing your application to control your Honeywell Resideo device.
Create a Connect Webview
from seam import Seam
seam = Seam()
webview = seam.connect_webviews.create(accepted_providers=["honeywell_resideo"])
assert webview.login_successful is False
# Send the Connect Webview URL to your user.
print(webview.url)
Authorize Your Workspace
Navigate to the URL that the Connect Webview object returns. Because you are using a sandbox workspace, complete the login flow by entering the following Honeywell Resideo sandbox test account credentials:
email: [email protected]
password: 1234

Get the New Connect Webview
After you complete the authorization login, you receive an event for connected_account.created
if you set up a webhook handler. Otherwise, you can poll for the Connect Webview until the status of this Connect Webview changes, as follows:
updated_webview = seam.connect_webviews.get(
webview.connect_webview_id
)
assert updated_webview.login_successful # true
3. Retrieve your Honeywell Resideo Thermostat
Honeywell Resideo thermostats appear with the device_type
"honeywell_resideo_thermostat"
.
devices = seam.devices.list(device_type="honeywell_resideo_thermostat")
pprint(devices[0])
# Device(device_id='06a561b6-09d2-401c-a25f-ddb1e1efd59e',
# device_type='honeywell_resideo_thermostat',
# location=None,
# properties={'available_hvac_mode_settings': ['off',
# 'cool',
# 'heat',
# 'heat_cool'],
# 'current_climate_setting': {
# 'heating_set_point_celsius': 16.666666666666668,
# 'heating_set_point_fahrenheit': 62,
# 'hvac_mode_setting': 'heat',
# 'manual_override_allowed': True},
# 'fan_mode_setting': 'on',
# 'has_direct_power': True,
# 'honeywell_resideo_metadata': {'device_name': 'T61',
# 'honeywell_resideo_device_id': 'c47711ec-4e8e-4785-ad3b-7a7e3f81e2b5'},
# 'image_alt_text': 'Placeholder Lock Image',
# 'image_url': 'https://connect.getseam.com/assets/images/devices/unknown-lock.png',
# 'is_climate_setting_schedule_active': False,
# 'is_cooling': False,
# 'is_fan_running': True,
# 'is_heating': True,
# 'is_temporary_manual_override_active': False,
# 'manufacturer': 'honeywell_resideo',
# 'max_cooling_set_point_celsius': 32.22222222222222,
# 'max_cooling_set_point_fahrenheit': 90,
# 'max_heating_set_point_celsius': 32.22222222222222,
# 'max_heating_set_point_fahrenheit': 90,
# 'min_cooling_set_point_celsius': 10,
# 'min_cooling_set_point_fahrenheit': 50,
# 'min_heating_cooling_delta_celsius': -17.77777777777778,
# 'min_heating_cooling_delta_fahrenheit': -32,
# 'min_heating_set_point_celsius': 10,
# 'min_heating_set_point_fahrenheit': 50,
# 'model': {'accessory_keypad_supported': False,
# 'display_name': 'Thermostat',
# 'manufacturer_display_name': 'Honeywell Resideo'},
# 'name': 'T61',
# 'online': True,
# 'temperature_celsius': 24.444444444444446,
# 'temperature_fahrenheit': 76},
# capabilities_supported=['thermostat'],
# errors=[],
# warnings=[],
# connected_account_id='4f43e060-298f-4614-9791-dc492d629063',
# workspace_id='398d80b7-3f96-47c2-b85a-6f8ba21d07be',
# created_at='2024-02-29T19:44:40.762Z',
# is_managed=True)
4. Set the Current HVAC and Fan Mode Settings
Seam enables you to adjust the current heating and cooling settings on a smart thermostat, including the HVAC mode and the corresponding set points. It also enables you to configure the fan mode. These two operations return action attempts.
For example, use the following code samples to set your thermostat to heat mode and the fan mode to on:
heat_request = seam.thermostats.heat(
device = "06a561b6-09d2-401c-a25f-ddb1e1efd59e",
heating_set_point_celsius = 20
)
pprint(heat_request)
# ActionAttempt(action_attempt_id='97125745-15d9-4970-b5be-c34ec3ce1c81',
# action_type='SET_HEAT',
# status='success',
# result={},
# error=None)
fan_on_request = seam.thermostats.set_fan_mode(
device = "06a561b6-09d2-401c-a25f-ddb1e1efd59e",
fan_mode = "on"
)
pprint(fan_on_request)
# ActionAttempt(action_attempt_id='9c9b584b-c645-4ce0-a9c2-79b6f1db2396',
# action_type='SET_FAN_MODE',
# status='success',
# result={},
# error=None)
Next Steps
Now that you have completed this guide, you can try to connect a real Honeywell Resideo device. To do so, make sure to switch to a non-sandbox workspace and API key because you cannot connect real devices to sandbox workspaces.
If you have any questions or want to report an issue, email us at [email protected].
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