Jeff speaks the truth. I replaced 6 golf cart batteries with 2 AGM bateries. The Golf cart batteries were in a settee and that settee housed the A/C Unit. The hygrogen was eating the aluminum air intake.
Golf carts are a great economical solution but venting is more important than you think and you do have to maintain them. Skipping the venting is not an option. The damage it does can be expensive not to mention the danger of hydrogen and acid spills.
12 volt AGM batteries do cost more up front but they take less energy to recharge and they have zero maint. costs and nothing to spill. I like the group 4 Concorde Lifelines for the budget, but a Rolls is not without merit.