Running your residential air conditioning system without a functioning condensate pump is generally impossible or highly destructive, depending on your indoor unit's setup. If your air handler or furnace is located in a basement, crawlspace, or attic where gravity cannot naturally drain the continuous stream of water produced by the evaporator coil, you must use a condensate pump to expel the moisture. Attempting to run the system without a pump in these locations will cause water to back up rapidly, overflowing auxiliary drain pans and causing severe structural water damage to your ceilings, drywall, and flooring. Furthermore, modern safety switches will shut the AC down. You can troubleshoot drainage paths easily. You can verify system safety when a fully operational condensate pump or gravity drain keeps water moving safely away from your home.
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