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Winter window condensation is one of the most annoying rental problems. After months of testing, I share simple, cheap, reversible fixes to stop window sweating, pooling water, and mold without damaging your apartment.
Tested 4 wifi-enabled thermostats for 90 days in 3 different rental layouts: a Boston rooming house (c-wire missing), a Toronto condo (HVAC rental strapping required), and a 1930s London flat (sash window + 1 boiler). 4 actually worked as a renter; 1 was an expensive owner dream.
My fourth-floor north-facing Boston window leaked so hard last March it killed my laptop. After three property managers and a hygrometer, I narrowed window condensation to 4 causes — one of them costs $0 and takes 15 minutes. Here's exactly which fix matches your apartment.