Do yourself a favor and remove any baffle plates mounted under the evap
coil that forces *ALL* airflow through the coils. This will reduce the
resistance to airflow that exists UNNECESSARILY during the heating
season caused by the coils and associated baffle or restrictor plates.
I did this a few years ago in my furnace, leaving only a couple of thin
brackets to support the coils within the plenum. Even for summer A/C
use, this does not seem to have an impact to household cooling, and the
reduction in resistance allows more airflow during times when just the
fan is running, which by itself is able to cope with our now cooler
summers in the great lakes area (if not most of the mid-west).
So stop wondering if your coils are causing too much restriction and
modify the situation so you allow more airflow around them, if only
during the winter heating season.
I'm surprised that even modern furnaces, with the insane lengths they go
to with sensors and expensive control boards to maximize efficiency,
don't allow for or have built-in ducting that can be switched in and out
as needed to duct air around the coils when cooling isin't called for.
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