If you buy the can of stuff, and the needed guages and thermometer, you will
get the right amount. Frankly, the job is pretty easy, if you need to ask
then you should see the professionals.
Follow the directions on the can and on the guage that you MUST have, and
you will be close enough to perfect as to improve the cooling.
Have you looked at the microfilter. If this is clogged, there will be very
little airflow, and even if the A/C is working well, you will be hot.
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