Force carbing in a keg is a closed system, elevation and air pressure are irrelevant.
At 43F you need 14psi to achieve 2.5 volumes of Co2. I usually 'charge' the keg by pressurizing to 30psi, disconnecting, then rolling around on the floor for 10 minutes. I then bleed the pressure, reset my regulator to the proper psi, and store everything in my fridge for at least one week.
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