If the device is off there is not a way to locate it in your home. There is a feature that sends the signal right before it turns off if you have it toggled on via: Settings > Tap on your name at the top > iCloud > Find My iPhone > Send Last Location toggled on. As crazy as this sounds I've found my device with it before depending on which end of the house it was at... and my house isn't that big. Find My iPhone is very accurate overall.
It happens to the best of us. As mentioned, your device would need to be powered on. Here's how to locate via Find My iPhone: https://support.apple.com/en-us/HT201472
I hope this helps you locate your phone. If not, please reach out, this way we can look into additional options.
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