HVAC Coil installed upstream


Can the coil (heat pump) be installed upstream on an electric furnace?I always saw them installed downstream and this furnace has a lot of discolouration inside the plenum and fan area. Thanks!

That is a common configuration in my area, but the rust is not common :wink:

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I was thinking that perhaps a blocked condensate line cause the pan to overflow and caused the rust but it’s just a thought.

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Yep! Another possible issue. Clogged coil fins will also cause condensation to drip and fall down the middle and not into the drain pan.

This an up-flow furnace, Marcel?
Tags, serial/model number please.
No worries although the condensate plumbing line is poorly installed.