I've seen some of those old style systems with the "fan blowing straight up"
and it sure makes me wonder what they were thinking.
When it's off during a snow storm.?.
Or just leafs coming down, filling up the
tub.
Is there a family of squirrels living in there?
Pics from:
Recipocating (Piston) Compressor
Anyways, some of those units have heating elements to defrost the coils.
And some of them may be
optional, so maybe her systems can be upgraded?
There might even be a generic add-on defrost kit that will fit her system..
Cheers,
Rich