Mold problem with tenants

[Jessie MacDonald]

Looking for any advice on what to do when a rental property has mold. Some info for you, we’ve owned this property for 4 years and have never had issues with mold in either unit until the current tenants moved in January 2024. Last winter, they notified us that there was mold growing in 2 of the bedrooms and condensation forming on the ceilings. We immediately took action and found out they had turned the heat off when the temperatures were below freezing. We then cleaned all of the mold and reinsulated the attic. Fast forward to now, and they say the mold and condensation is back and it’s bad for their child’s health. They’ve insisted they are keeping the heat on. Any advice on what to do in a situation like this would be greatly appreciated!!