What to do if your landlord doesn't fix your furnace?

If your landlord doesn't fix your furnace, first document the issue by taking photos and keeping records of your communications. Next, send a formal written request for repairs, specifying a reasonable deadline for completion. If the landlord still fails to act, you may consider contacting your local housing authority or tenant's rights organization for assistance. In some cases, you might have the option to withhold rent or make the repairs yourself and deduct the cost from your rent, but be sure to understand your rights and local laws before proceeding.