I have a client with three Carrier air handling units (a 25 Ton, 15 Ton and 10 Ton). These units cool and dehumidify their zones all year due to high internal loads. During hot summer months, these units consume a significant amount of natural gas to reheat the air after dehumidification. I suspect utilizing hot gas reheat within the units could reduce or even eliminate their summer natural gas consumptions. I have seen hot gas reheat on many newly installed units. However, I do not know if it is possible (or common) to retrofit an existing unit to have hot gas reheat. Is it possible or common? Thanks.