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After feeling the difference between an 800 and a 2,000 over many months, in an impressionistic rather than rigorously journaled fashion, I have one of these permanently in home/home office and made changes to plans re: airflow to avoid “routinely 2,000 in winter.”
(One human plus a closed door and windows in a small insulated room plus perhaps a nap in the office can easily spike you to 2,000. You do not want to be doing intellectual work at 2,000. The malaise is physically perceptible.)
“What changes did you make?” When moving, picked a home/room with a very large air volume attached to the office. This pessimizes for heating simply/cheaply (I have to use a space heater and deal with variability) but makes it impossible for me to solo exhaust the O2.