Replacing the outdoor unit could also mean replacing the indoor coil to match refrigerants. I don't like replacing compressors in out of warranty residential units. They generally come w/ a one year part warranty and check w/ your contractor on the labor. New units will tend to have a 10 yr comp warranty. It's also not uncommon to replace the unit/compressor only to find out the indoor coil caused the failure and the coil also needs to be replaced.

my two cents

Hi, it will be better if you go for a professional help.
Check with your service provider and get it fixed.

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