How to connect my Honeywell thermostats, controllable via the Resideo or First Alert app, to my eSPACE account

• Thermostat Compatibility

• Confirm Thermostat Compatibility with Sales 

• How the Integration Syncs 

• Adjusting Temperature on the Thermostat During an Event

• How to Know if an Override is from eSPACE

• How to Connect Honeywell Resideo or First Alert to eSPACE

• Connection Tab: Adding Credentials/Connecting accounts

• Device Tab: Global Set Points, Assigning Spaces to Thermostats, Statuses, API Logs

• Status at Top Right

• History Tab: History of API calls sent to Honeywell, log of setting changes in eSPACE

Thermostat Compatibility

• Thermostats must be connected to one Honeywell OAuth account through a Resideo or First Alert account

• Thermostats that Honeywell sells that are NOT compatible with their API, are not able to integrate.

Confirm Thermostat Compatibility with Sales 

• Adding to an existing eSPACE subscription: Schedule a demo with your Customer Success contact

• New to eSPACE: Schedule a demo with Sales

How the Integration Syncs 

• The integration runs automatically in the background:

  • Every 30 minutes, eSPACE checks for upcoming events that need a thermostat override and caches them.
  • At the event's HVAC start time, eSPACE sends that override to the thermostat.

  Overrides only, not schedules. Honeywell's API only lets eSPACE send temporary overrides — it can't push full schedules or recurring events to a thermostat. Because of the 30-minute check cycle, changes made in eSPACE (new events, edits, thermostat assignments) aren't reflected on the thermostat instantly; they take effect on the next sync after the event is approved.

  Overrides behave like an in-person hold. When eSPACE sends an override, it looks identical to someone walking up and setting a hold manually at the thermostat — it will display as "Hold until [time]".

  Overrides clear automatically. When the eSPACE event ends, eSPACE sends a command to cancel the hold, returning the thermostat to its normal Honeywell schedule.             

Adjusting Temperature on the Thermostat During an Event

• Once the event's start time, setup time, and ramp time have all passed, staff can adjust the temperature directly on the thermostat. The new temperature will hold as set.

How to Know if an Override is from eSPACE

• A thermostat can end up in a hold two ways: eSPACE sending a scheduled override, or someone setting a hold in person at the thermostat. To tell which one you're looking at, check the FACILITeSPACE integration module — it lists every override eSPACE has sent, so you can compare it against what the thermostat is showing. See the Device Tab section below for where to find these logs.

How to Connect Honeywell Resideo or First Alert to eSPACE

1. Click My Module in the top right and select FACILITeSPACE.
2. In the Integrations module, click Integrations to expand it, then select Honeywell. 
3. Switch to the Connection tab and click Connect to Honeywell. 

Important: enter the account owner's credentials in eSPACE — only the owner login lets eSPACE discover the connected devices.

Connection Tab

Once connected, the Connection tab shows your saved settings, including:

Write Access: This is the master on/off switch for the whole integration. It controls whether eSPACE syncs anything to your thermostats at all, and applies across Resideo and First Alert.

Device Tab

The Device tab lists every thermostat connected to eSPACE. All times shown here display in your browser's time zone.

Global Occupied Set Points

Set the default occupied heating and cooling setpoints eSPACE uses whenever it sends a thermostat override for an event. Click Save after changing a value.

Assigning Spaces to Thermostats

Click the pencil icon next to a thermostat to assign it to a space. For eSPACE to send an override to a thermostat, both must be true:

1. The thermostat has a space assigned to it.
2. That space is on an approved event with an HVAC start time in the future.

Thermostat Statuses

Each thermostat on the Device tab shows one of four statuses (Runtime column):

Expand any thermostat to see its individual API logs, including the eSPACE event name tied to each override — the fastest way to confirm whether a given hold came from eSPACE (see Identifying an eSPACE Override, above).

Event API logs

In the API call you will be able to see the eSPACE event name. 

Status at Top Right

In the top right of the integration, you'll see the overall connection status:

• Online — the integration has synced successfully with Honeywell within the last hour.
• Error — the integration hasn't synced in over an hour.

If it remains on Error, reach out to eSPACE support.

History Tab

The History tab shows the latest integration activity — essentially, a record of whether and when eSPACE has synced overrides to your thermostats. Times here display in your browser's time zone.

Included in the API History section of the History tab could be the following:

Integration Sync & Overrides Definitions

• Universal Sync = any and all Honeywell thermostats that you have connected to eSPACE that need an override for an event "now" have been sent an override
• Sync Overlay Device = Per-device overlay sync result. When the sync fails for an individual thermostat, the description may include [RateLimited], [PortalWriteRejected], [PortalVerificationFailed], [SessionFailure] , or [Unknown]
• Set Overlay Hold = eSPACE sent an override for a thermostat based on an event
• Release Overlay Hold = eSPACE released an override on the thermostat
• GetScheduleContract = eSPACE synced in the current Honeywell schedule for the thermostats in order to populate the "Live Honeywell Schedule" on the Connection Tab in eSPACE (used for Support troubleshooting)
• Sync Schedules = the sync to push overrides to the thermostats started and stopped
• Sync Schedule Devices = per thermostat schedule sync
• Set Schedule, Set Schedule Preflight, Set Schedule Verify, and Set Schedule Fall Back = part of logging when scheduling thermostats
• RefreshToken = eSPACE refreshed the token needed to send API calls to Honeywell

Audit Logs for Settings

The History tab also logs setting changes made within your Honeywell integration in eSPACE — including who changed an occupied set point, and when.