Trane Gas Hot Air Furnace Extended Warranty Cost ?

A bit surprised on the quote by the Installer for a 10 yr P&L extended warranty for a new Trane Gas Hot Air furnace
(residential; the 80% model, 120 K, 2 stage, with var. speed blower) Model No. TUD 120 R 9V5K
Does $700 sound in the ball park for a 10 yr P&L for this type of unit ?
Thanks, B.
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