that depends on the speed of the leak and the amount of ammonia involved; as i said, ammonia-absorption refrigerators are in common use today, including in homes, and they do not have a high death toll (though large industrial ammonia-absorption systems do regularly kill people, about 20 people a year in all of prc, for example: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9318737/)
osha's idlh level is 300 ppm; in a typical small house of 200m³ that's 60 liters of gas, 2.5 moles at stp, about 40 grams of ammonia; this is a small enough amount of ammonia that you could definitely get it from a home refrigerator (https://www.dometic.com/assets/18/22/operating%20manual_5182... says it contains 226g of ammonia, which would be 1600 ppm in that houseful of air) but only if it's released quickly. lc50 for a one-hour exposure is in the 4000 to 11000 range https://www.cdc.gov/niosh/idlh/7664417.html which is several times more than the entire refrigerator's worth if diluted in a houseful of air
osha's idlh level is 300 ppm; in a typical small house of 200m³ that's 60 liters of gas, 2.5 moles at stp, about 40 grams of ammonia; this is a small enough amount of ammonia that you could definitely get it from a home refrigerator (https://www.dometic.com/assets/18/22/operating%20manual_5182... says it contains 226g of ammonia, which would be 1600 ppm in that houseful of air) but only if it's released quickly. lc50 for a one-hour exposure is in the 4000 to 11000 range https://www.cdc.gov/niosh/idlh/7664417.html which is several times more than the entire refrigerator's worth if diluted in a houseful of air
the odor threshold is about 5 ppm https://en.wikipedia.org/wiki/Ammonia#Safety so it's unlikely to go unnoticed