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For weeks, Ross Carolan and his family felt sick but didn’t know why. Ross, his wife and their two young children were all feeling lethargic and coughing. Even their cat was irritable instead of her usual friendly self. This was in fall 2022. In what seemed like an unrelated issue at the time, the humidifier on Ross’s furnace had been leaking water, so he contacted a plumbing and heating company. This call may have saved their lives. The furnace technician used a Gas Measurement Instrument and found the furnace room contained 385 parts per million (ppm) of carbon monoxide (CO) — a life...