Is it safe to use portable mini evaporative air coolers inside a yacht?

I was wondering whether it is a good and safe idea to use the portable mini air coolers inside a yacht for an extended period of time. I keep the yacht's air condition system running 24/7 for a period of 5 months, from May until September even with the yacht empty and moored in the marina. Ambient temperatures range from 35 degc to 45 degc during this period and constant air conditioning is necessary to preserve the interior of the yacht.
These portable air coolers are an evaporative air cooler designed to pull warm air from the room through its evaporative water filter to humidify while cooling. They contain a water tray which needs to be filled or topped up with water daily. I have seen them in operation outdoors and they are quite effective. I am worried that the large amount of daily evaporating water inside the yacht could cause damage to the yacht's interior. Ofcourse if these portable air coolers can be safely used inside the yacht while the yacht is stationary and empty of guests while moored in a marina, they will help preserve the yacht's onboard air-condition system and reduce the system's operating hours.

I would appreciate hearing your thoughts on this subject.

Below is an image of a portable mini air cooler.

Correct, but that is if the yacht is kept in a cool and humid location. De-humidifiers don't drop temperatures. Our location is different. The Red Sea is dry and very hot during summer months. I need to keep the yacht's interior at a controlled temperature of approx. 25-26 degc using the air-condition. If the air-condition is turned off, main deck temperatures inside the yacht can rise to 40-45 degc which overtime will damage the interior.

..... I was confident this will be the answer. I guess I have to keep running the air-condition system.

That is exactly what I am doing now and have been doing for the last 10 years in all my boats. Shore power is not very reliable in Egypt especially in summer where we experience sudden spikes or high drops in voltage. I have had quite a few circuit boards burnt as a result of these voltage fluctuations. I was looking for an option to keep my air-condition equipment safe when connected to shore power.

I do have isolation transformers, one on each shoreline but they won't provide protection against a fluctuating voltage.

Yes, I am aware that these are available but it won't be possible to use them. That will mean something needs to remain open for the exhaust hose.