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Why does my house smell like ammonia at night?

GeneralClass 12AllAnswered 27 Mar 2026
Answer

An ammonia smell in your home could indicate several issues: bacterial growth in drains or HVAC systems, pet urine that needs cleaning, a refrigerant leak from air conditioning or refrigeration equipment, or rarely, a natural gas leak (which has ammonia-like components added). If the smell is strong or persistent, investigate the source immediately and consider calling a professional, especially if you suspect a refrigerant or gas leak.

General · Class 12