Looks like this varies depends on if you are a local renter and if you are using a credit vs debit card. Hope this helps!

I'm reading this on their website for policies for MCO:
For Debit Cards: "Must have available funds to be taken as a deposit at the time of rental in the amount of the estimated rental charges plus USD/400.00"1. The credit card must have the available funds for the estimated amount of rental charges, plus a deposit of USD/150.00.

NOTE - Local renters in FLL, TPA, RSW, MCO, MIA,OAK, SFO, SJC, LAS, ORD and SLC must have available funds for the estimated amount of rental charges plus a security deposit of $500.00 - $1000.00 USD when renting Economy, Compact, Midsize, Standard and Full Size car classifications. All other car classifications must have available funds for the estimated amount of rental charges plus a security deposit of $1,000.00 USD. Debit cards not accepted for local renters.