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Old 02-17-2020, 08:41 AM   #1
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SpudNuts's Avatar
1964 19' Globetrotter
Choctaw , Oklahoma
Join Date: Jan 2020
Posts: 18
64 GT A/C Retrofit

I've seen some post asking about this but haven't really found anything that give some ideas on how to do it.

I have a 64 GT that i'm restoring. I want to keep the skylight and the vent and i've head that a AC unit can be added in the middle.

Has anyone tried this or has anyone actually add an AC unit to a GT that wasn't designed for one and if so, is there anyone that has plans or ideas on how to do it.

Thanks for any help
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Old 02-17-2020, 06:26 PM   #2
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1958 26' Overlander
Battle Ground , Washington
Join Date: Jun 2013
Posts: 871
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For the older models such as we have I would recommend reinforcing the area you mount the unit. I created a rectangle of 1.5" square aluminum tubing (the thickness of walls, yours may be different). I wanted to be able to tie into at least one existing rib and the cross pieces between the ribs. This does create a flat spot in the outer skin when you bolt down the A/C. I was more concerned with having a good seal than the more complex approach to match the curve of the roof.

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The items circled in the second photo are the factory reinforcement where the ribs were spliced together. Don't know if you'll have those of not.

I've read that others have done the same with wood and have been satisfied with the results.

If you do the reinforcement you'll have to drill a couple holes in it to feed wiring and drain tube. For the wiring I inserted a small piece of tubing in the hole and flared the ends to protect the wiring (not needed for wood). You could accomplish this also with a piece of split wire loom (plastic).

Whether you mount to an existing vent or another area, just follow the A/C manufacturers instructions for the size of the opening in the roof skin.

The hardest part is getting the A/C unit on the roof. Be careful you never want to put any weight on the roof other than directly over a rib. A piece of plywood that overlaps at least 2 ribs will give you a platform to work from. The lines of rivets that go all the way from side to side will help you locate the ribs.

You'll want at least one other person with you. They're on the ground, after you get the unit on the roof, to hand you the items you forgot
Harold & Rebecca

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