Effect of low-pressure cell on RHVAC equipment

[desA]

What effect does a low-pressure weather cell have on RHVAC equipment?

I have noticed certain system operating conditions where the system performance - specifically evaporator - can vary immensely, with seemingly small differences in ambient temperature & humidity.

Many thanks for your contribution.

:)

[desA]

To progress the discussion a little further:

When a low-pressure cell moves in over a region, what happens to the air density?
How does this change in air density affect the puller/pusher fan/s?
If the fan throughput is affected, what happens to the evap performance?
Is the condenser performance affected?