I imagine that you are seeing R134A freon for sale in the stores,it was not around when your coach or basement AC units were manufactured.AC units should not leak freon,but if they do you cannot charge them properly without a set of gauges and charts or knowledge.I would recommend that you find a good hvac person that is willing to inspect the units and clean the condenser coils and properly charge each unit.Most of this should be routine maintenance for all coaches.
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