A few minutes ago, I released version 0.2 of my HVAC Zoning App. See here. It is designed to do a lot more than operate an HRV, but there is no reason it couldn't be used for that and not implement much of the other functionality. In the App, the amount of ventilation desired is set using a virtual dimmer. The level is used to indicate the percentage of each hour that ventilation should run. If you have information available in Hubitat that lets you estimate how many people are in the house, you can set up a rule to set the dimmer level accordingly.
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