Early today, we had some visitors knocking on our door for a house check. The neighbor below us has had complains of water flooding their living room ceiling corresponding our side of the balcony. It happened years ago, during a rather strong downfall that happens in Vienna once in a blue moon. He thought that we drilled some holes somewhere that caused the water to flood. We already had our heaters and what else to check examined three times in the past - probably 3 years ago as mentioned - it was long ago. There was nothing found. And it's still the issue today...it is a bit unnerving to say the least. I don't know much about HVAC installations but I'm sure that an HVAC system is a ...

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