Thanks for reaching out. The Time-to-Temperature provides an estimate of how long it will take for your HVAC system to reach the desired temperature and it is dependent on multiple factors. Most smart thermostats help homeowners get a longer life out of their HVAC systems, maximize efficiency, lowering energy usage and utility bills at the same time. Did you verify that your HVAC is running the entire 1.5 hours? Sometimes it shows that information but it does not run as long as what's displayed.
Hope that helps! 🙂
Thanks for posting in the Google Nest Community forum. I hope you get the answer you're looking for provided by listairee. Please let me know if you have further questions or concerns, as I'll be willing to assist you from here.
I appreciate your help, @listairee.
Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.
I appreciate the help, Jenelyn.