Rats.

[Mike Lamb]

I found these in the fan compartment of a Goodman furnace.

It may be why the house had 5 or 6 cats. It was also the most pet filthy, foulest smelling occupied home I have ever inspected.

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[John Kogel]

Warm and dry. The simple pleasures of animal life.

[Tom Raymond]

I had rats once. They didn't stay too long in my boiler, but they sure did like the refractory insulation. Little bastards took the blanket out from under the burners.

[Erby]

What did the coils look like. Covered with cat hair, I'd bet.

[AHI in AR]

Looks like they couldn't run fast enough to stay on that exercise wheel in there!

[Mike Lamb]

What did the coils look like. Covered with cat hair, I'd bet.

The sellers said they were having trouble with their air-conditioning if that is a hint. I did not look at the AC coils. They had two furnaces and both had collapsed cat hair clogged filters that were sucked into the fan.

[Rob Amaral]

I once opened a 'bin' over a water service area in a cellar in the North End of Boston.. 10-12 rats split through the foundation and the stench of rat urine almost made me chuck-it right there.. dang... Nothing like BOSTON HARBAH rats...Golly..

[Erby]

When I can't see the coils, I get a picture of the blower fan blades to see if they're crud covered.