Having a professional HVAC technician come out to clear a clogged condensate drain line typically costs between $75 and $250, depending on your local service rates and whether they use compressed nitrogen, mechanical snakes, or chemical flushing agents. However, if you choose to clear the blockage yourself as a DIY project, it costs virtually nothing using a household wet-dry vacuum at the exterior drain discharge pipe or a cup of white vinegar poured down the indoor cleanout port. Verification: Pour a cup of water down the indoor cleanout port to confirm it flows freely outside.
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