Quote:
Originally Posted by old_master
If you just drain the system without evacuating it, there is still "air" at atmospheric pressure in the system which will affect performance. Evacuating to 29.4" Hg will remove the "air" and any moisture in the system so when the system is charged with the proper amount of refrigerant, the pressures are not needlessly excessive.
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is there some equipment that i can get to do the evacuation job at home or do i need to brng it to a shop? if theres a home version, is it pricey or reasonable enough to but it and get one or two uses out of it.