Using air exchanger pipes for air conditioner flow?

I did put an window air conditioner to blow cold air trough the air exchanger pipes. The air exchanger fan push the cold air upstairs. This seams to be OK since I am able to adjust cold air flow on each room, but I would like to know if this would work long term. Is any possible issue regarding molding in the future? Effectively I did modify the air exchange installation (during the summer season) to pull cold air from air conditioner and to push it upstairs. The air exchanger pipes are from vinyl and part of them are insulated.
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