Considering replacing HVAC with window AC units

[Blake Jones]

Hi all. I have a rental where HVAC needs replacing (central heat and air). I'm considering putting in window AC/Heat units instead of replacing it. My main concern is if the pipes will freeze in winter without thermostat controlled heat. It is in N. Florida which usually only gets below freezing a few times a year. But sometimes it can get pretty cold. Any thoughts or experience here? Thanks!