About a year ago, I called Garwood's to fix a drain on my air conditioner. The plumber, who charged $160 for a job that took less than an hour, told me that the furnace fan case was cracked and should be replaced. He said it was a CO leak hazard, which I later found to be untrue.
He quoted me a price of about $850 to do the job.
I looked into further and found fans cost from $100 to $150. Replacement is a straightforward job the DIYers report doing in 15 to 30 minutes.
When I called Garwood's and asked for a breakdown on parts and labor I was told they would not do that. For obvious reasons.