Measure everything.
The more inside/outside differential temperature,
the more resolution you get.
I'd measure both inside and outside. Otherwise,
you have to guess the leakage path.
Windy day can give you even more info.
I had my house weatherized. Then I went around with a
caulking gun. The "after" blower door test determined that
the ventilation was below standard for the structure.
I live alone and don't cook much, so it's not unsafe,
but it does get stuffy enough in mid winter that I built
a heat-recovery ventilator and stuck it in a window.
Makes a big difference in the stuffiness.
I second the turning on the vent fans while leak testing.
The vent over my stove can pull a 5 Pascal
vacuum at the other end of the house.
If it's winter, I'd suggest turning the heat up to high,
wait a couple of minutes, then see what heats up.
Crawl around in the basement with the camera.
Might show leaks in the air handler.
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