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The Ontario Winter Maintenance Checklist: 20 Steps Before Your Heating Season Opens

Toronto's heating season changed in 2025 and most guides still print the old dates. This checklist gives you the current numbers, the provincial floor underneath them, and the twenty things to do in one September morning — so January isn't when you find out.

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What's Inside

All 5 steps

  1. Look up your municipality's current heating by-law — this year's version, on the city's own site
  2. Diarise both ends of the season: Toronto Oct 1 – May 15, Hamilton Sept 15 – May 15
  3. Take any portable heater out of primary-heat duty — that one's a flat prohibition
  4. Define common areas vs exclusive-use areas in the lease, in plain language
  5. Send the December email asking tenants to flag extended winter absences

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