Cooling options without built-in AC?

33RPM

33RPM

Member
Joined
Feb 10, 2026
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I’m interested in knowing about cooling options for a boat if the climate inside the cabin gets hot. I know boats like a Ranger Tugs R-31 CB come in an LE option that has AC. What are the options for a boat around that size for cooling inside if you do not have AC? I’m interested in what could be done professionally as a retrofit, what are the risks and costs of those options, and what could be done as solutions moored and anchored without some type of built in retrofit. Thanks for your expertise and insights!
 
At one time I had considered installing a RV rooftop air conditioner on my boat utilizing one of the skylights. Basically removing the window and replacing it with a 12 volt RV rooftop unit. Cost is less than a $1,000 and twice the BTU’s of the previous mentioned unit. They are on most campers, vans and semi-trucks not to mention tractors and various construction equipment.
Since I spend 90% of my time in the PNW I gave this modification up and bought a heater!
Bob
 
33RPM said:
I’m interested in knowing about cooling options for a boat if the climate inside the cabin gets hot. I know boats like a Ranger Tugs R-31 CB come in an LE option that has AC. What are the options for a boat around that size for cooling inside if you do not have AC? I’m interested in what could be done professionally as a retrofit, what are the risks and costs of those options, and what could be done as solutions moored and anchored without some type of built in retrofit. Thanks for your expertise and insights!
Click to expand...
Swamp cooler. Buy an appropriate sized radiator, 1 or 2 12v fans set up to blow across the radiator coils/fins, fabricate a box or cabinet for it to fit in. Size depends upon area you are trying to cool and whatever temperature differential you are trying to achieve.
 
If you’re spending the money on a 31 consider just installing AC. We did the install in our R23 for about 8k for a 10k reverse cycle webasto. Most of the tugs are already wired or at the very least have a location for the AC to be installed. We just had to install the plumbing and thru hull but it’s fantastic
 
If you’re spending the money on a 31 consider just installing AC. We did the install in our R23 for about 8k for a 10k reverse cycle webasto. Most of the tugs are already wired or at the very least have a location for the AC to be installed. We just had to install the plumbing and thru hull but it’s fantastic
 
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