I love these. I put one in each bedroom to supplement the heating system. They are safer than a portable heater, which could catch something on fire, and they only use 400 watts.
I know some folks hate Amazon but they are not that pricy at all. Might pick one up for my mud/wash room and see how well it works.
https://www.amazon.com/Envi-High-Efficiency-Whole-Electric-Heater/dp/B086N4MJ2M
A family member recommended a wall heater:
https://www.amazon.com/Envi-High-Efficiency-Whole-Electric-Heater/dp/B086N4MJ2M/ I guess that could cause the same issue.