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If it makes more heat in the cabin than you want or it can't be controlled well during the summer months then it seems to me like it doesn't work well at all.
Condensers don't like heat no matter what they are made from. This was a problem back in the day of wax paper insulated condensers and has been a problem with mica and mylar materials as well. They hold up better with modern materials but excessive heat is still not a good thing. The blow proof types hold up well on cars with no heater but I don't know about those that have a manifold heater like the one posted. If I idle my model A too long in the south Texas heat, there is no telling what the temperature of the distributor gets up to. If the car is moving down the road, it's not too bad.