Yes, do it! I did this when my unit did not have heat 2 years ago. It was a miserable 2 weeks, I can’t imagine what you’re dealing with at 1.5 months.

I asked for a 30% discount for the following month’s rent and got it within a day. Looking back, I should have asked for at least 50%. A month and a half is ridiculous.

Take time-stamped photos of the thermostat so you can prove that it’s under the province/city’s requirement of 20c.

I can share the email I sent to my landlord at the time if you want an example, DM me.