Flush Out Path 1 Only During Daytime

We are currently pursuing this credit using the flush out option Path 1. We are capable of maintaining the temperature in at least 60°F and RH no higher than 60% since the ventilation systems are turned on only during the day (from 7am to 5pm). However, outside night temperatures can drop to 40°F. Our strategy is to flush out the building only during daytime when outside air complies with the 60/60 requirement. Temperature and RH readings will be made during the same period of the Flush Out It is possible that during the night inside temperature drops below 60F; do you think that non-compliance with 60/60 requirements at night (when we are not flushing out) would compromise credit compliance? Thanks in advance