4000 sounds pretty expensive for a basic furnace, hopefully this is for a dual-stage (hi and low heat) furnace with a DC servo blower (uses much less power than normal blowers when running at low speed).
If your current furnace is a basic contractor-grade unit (which is likely) then you can probably get an equivalent quality furnace installed for much less.
Can you dig up a bit of info on your current furnace ?
M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39 M5HP, M40ti, Sierra-1 LFR1100 active, ADA1500-4 and -8
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