(Occurred last summer, just now updating)
Found myself with very simple issue on a ~6-year old unit - exhaust fan (outside) failed. Very disappointed in response I received from McLintock when I contacted them seeking to purchase replacement fan and install myself. The representative insisted on $90 service call to determine issue. Them stood behind some policy that they couldn't sell parts. I understand to a degree but they've lost a customer due to their insistence on making a buck and lack of willingness to help or direction to solve my issue. This highlighted how they've tried to upsell me on every visit for the past couple years - I overlooked previously because I have no issue saying 'No.'
I wound up finding a replacement fan online, thru a willing merchant; installed myself and all is well for a year now.