[trit21]

There is no issue with leaving the Air-Conditioning running all the time as long as there is someone there to check on the boat on a regular basis. I would also make sure that you have high water bilge alarm. If you do not, have one installed. If there is no one to check on the boat for more than 24 hours, I would not run the Air-Conditioner. If a raw water cooling line were to spring a leak, it could easily sink the boat. The 110V Air-conditioning pump most likely can overwhelm the 12V DC bilge pumps after a while.

Running the Air-Conditioning keeps the cooling pump running for much longer and this is going to require that the sea-strainer be cleaned more often and most likely you are going to have to clean the raw water cooling lines at least yearly. Using the Dehumidify mode drops the water pump usage to something like 20%, but as mentioned above, it does not actually cool the cabin. What it does is it turns on and drops the temperature 2 degrees and shuts off on a schedule. You can ready your Air-Conditioning manual to figure it out. Some actually have different schedules you can set - HU1; HU2; HU3. You still have to clean the strainer, just not as often.

Check your AC pump but on my boat the AC pump is 500 GPH, while my bilge pumps are 2000GPH mid, 2000 GPH aft, and a 500 GPH in the forward section. SO, even if the line was to break and the AC pump could flow into the bilge, the first mid bilge pump will more than take care of the influx of water, along with my aft most pump at another 2000 GPH, should not be a problem. I also leave the battery charger on all the time so the batts will be charged. So I would check the ratings to make sure you are protected at least in the this scenario.