> HVAC circuit boards cost $100. This very much depends on the brand and the board, no? A quick search for the brand the OP mentioned (Daikin) shows some boar

> HVAC circuit boards cost $100. This very much depends on the brand and the board, no? A quick search for the brand the OP mentioned (Daikin) shows some boards easily in the $1000 range. Just one example: https://airconditionersrus.com/en/components-parts/2423-daikin-4009629-printed-circuit-assy-control.html https://airconditionersrus.com/en/components-parts/2423-daik... I don't know the details of OP's situation, but I'm not sure what makes you say such things so confidently.