I use a 9 inch angle grinder for cutting open AC or fridge/freezer casings, works well.
The discs are NZ$7 or cheaper & that will cut over 20 casings.
Theres a nice video on UTube from a Aussie guy who has made a motorised turntable that rotates the unit while he cuts it in 1/2 using a grinder.
Those double disc saws are really only for drywall & wood & light craft metal jobs.
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