A oil furance hot air systme is being replaced with a Low Tempature Heat Pump system. shoud I start a new data log, delete old or do anything??
I generally recommend people keep their old data for comparison, but use the Settings > Custom Start Date to allow your temperature profiles to recalculate the date of a major change or new system install.
Thank you 
charge made, not sure of date format, used xx/xx/2026