You really need to replace your ducting.

Your ducting is practically paper thin, and you are losing a ton of heating and cooling efficiency by the time the cooled or heated air reaches the vents.

The ducting I put in has two inches thick of insulation.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".