Thank you for you thorough response.... Yes, I didn't try to deduct anything related to the HVAC system when we had it upgraded nor the solar. Your response was lining up with my thoughts about how to prorate.... fortunately, there have been a few weeks where he has traveled for skating competitions, so I can use those days presumably to determine a "baseline" for usage without the additional cooling as I have stayed behind to work and take care of the dog.
