They are a must for my next rig. Coupled with a solar charger, and either a rain sensor or a cover, they do wonders in keeping a stored RV from cooking in the Texas heat.
Our TT was less that a month old when I installed two of them in it. They both have the thermostat feature and are very handy. Too bad they no longer have a life time warranty, that was the icing on the cake.
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