Had a compressor replaced a few months ago, and the bill again was about $110, tenant raved about the fridge it was so good afterwards (apparently it was quiet, so quiet they had to keep rechecking the fridge).They really aren't expensive to repair, and not particularly difficult either.

The seller isn't going to credit you anything, and yet, within 5 years you will be putting a new compressor or air handler in.

I've preferred a small air sprayer over a Ryobi quart airless, but the compressor for it is not portable.

Lessons learned - If there are window air conditioner units in an eight year old house with central air then your evaporator coil is full of cat/dog hair and your compressor is bad.

BBQ Nat Gas hoses have quick connects.....like a air compressor.

Tools he use is a compressor and a table saw.

. $5-6k should cover the compressor and install.

The compressor of a fridge couldn't care less if it has a stainless steel box or a green cardboard box around it.But if you choose stainless, consider that if you go for the cheapest, you will get the cheapest, incl. the looks.

A typical service on AC units is cleaning the coils, throwing the High/Low gauges on it to check pressure/compressor performance, and putting a multimeter on the capacitor. 

Or seized compressor and $5k+.....