Hi Tami
The boat we sail on is an older mono without A/C
You will be sailing in May / June which can be gorgeous with great breeze or rainy , hot and humid . Not nice with all the hatches closed at night . Our boat had great ventilation if there is no rain but can get very hot if weather necessitates us to close her up . We typically choose anchorages with great breeze and anchor outside the mooring field . We have travelled late May early June for the past four years and have been fine . I would take done battery operated fans with you and baby powder to help feel dry if lots of humidity and rain . That's a lot of extra money for A/C .... I would take my chances ...

Hope that helps a bit.... Oh and by the way ... I am also 52