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No heat or cooling at all now; was sporadic. Any ideas on what to fix & cost? on 2001 Toyota Highlander

Heater and AC no longer work - was sporadic but able to fix sometimes (not always) by twisting knob for temperature and getting it in the "right" place. Then left it exactly there and only used on/off. But now nothing works except the fan does blow current temperature air.

Asked by for the 2001 Toyota Highlander
sounds like the controller contacts are bad inside the dash controls. seek a diag and est as not to waste $
Toyota's diagnostic revealed the need for climate control unit (parts & labor $1025). Is that reasonable for a dealer?
WHAT IS THE BREAK DOWN OF PARTS AND LABOR