Teebutch, you are correct on the 9000 unit for the 260. I solidly used Mermaid for the service and pioneered many installations on boats to include the 26 and 260. I also like the Condensator unit Mermaid builds that helps to remove the water from the condensation pan via the overboard discharge eliminating issues of the condensation pan from overflowing into the bilge.
One big issue when folks brought their boats to me because the condensor would freeze up was due to poor circulation of air to the unit which necessitated bigger holes for ventilation and even sometimes dc powered fans blowing air onto the unit from the cabin.
When installing, I insisted if a used boat that all gear, cushions, etc. be removed no ifs ands or butts plus the owners could not board until I had a chance to finish and clean up. Sometimes the woman would get apprehensive seeing what had to be done for example cutting holes for the vents and duck work plus it could be messy while I am working. At the end of the day, I would always clean up vs. leaving debri accumulated like I saw a time or two at other installer dealerships.