We Shouldn’t Operate Tomorrow’s Building on Yesterday’s Climate

Petition for Updated, Climate-Responsive HVAC Changeover Dates

To: Board of Directors & Property Management
From: Residents of [Building Name]

We ask the Board to update our building’s seasonal HVAC changeover dates to reflect Toronto’s changing climate, while using actual weather forecasts and indoor temperatures to determine the final timing.

Our traditional changeover schedule was based on historical weather patterns. Those patterns are changing.

Toronto is increasingly experiencing warm weather later into the fall and earlier in the spring.

If the climate has changed, our thresholds need to change with it.

Update Our Default Changeover Dates

We ask the Board to consider moving our default seasonal changeover dates:

Fall heating: approximately October 15 → November 1
Spring cooling: approximately May 15 → May 1

These should be targets, not rigid dates.

If sustained cold arrives earlier, heating should be activated sooner. If significant heat arrives earlier, cooling should be activated sooner.

Update the baseline for today’s climate, then adjust for the actual weather.

Extreme Indoor Heat Is a Health Concern

This is not simply about comfort.

Toronto Public Health warns that sustained indoor temperatures above 26°C can affect health, particularly for people vulnerable to heat, with risks increasing further at sustained temperatures of 31°C or higher.

Excessive heat can contribute to dehydration, headaches, dizziness, sleep disruption and heat exhaustion, and can worsen existing health conditions. Infants, older adults and people with certain health conditions are particularly vulnerable.

Protecting residents from cold should not mean exposing other residents to potentially harmful heat.

We recognize that shaded, north-facing and other units may become colder sooner, and no resident should be left below required minimum temperatures.

But when a unit remains safely warm and is simply cooler than preferred, residents can add layers and blankets.

Residents of an excessively hot unit have far fewer options—particularly when the building itself is actively adding heat.

Our HVAC policy should protect residents from both extremes.

Plan Ahead—Don't Wait Until the Last Minute

We recognize that HVAC contractors are in high demand during changeover season and must be booked in advance.

We are not asking management to book contractors at the last minute. We are asking management to plan flexibility in advance.

The Board should investigate reserved service windows, tentative dates or similar arrangements that allow the final timing to consider the best available 7–14 day forecast and actual temperatures within our building.

Plan early. Reserve capacity. Adjust for the weather.

What We Are Asking For

We request that the Board:

• Update the seasonal baseline: Consider approximately November 1 for heating and May 1 for cooling, instead of October 15 and May 15.

• Keep the dates flexible: Earlier heating or cooling should remain possible when actual conditions require it.

• Use forecasts: Review the 7–14 day forecast before confirming changeover.

• Measure our building: Consider temperatures in both warm/sunny and cool/shaded units.

• Protect residents from both extremes: Consider the 21°C minimum temperature requirement alongside the health implications of sustained indoor temperatures above 26°C.

• Plan contractor capacity early: Explore reserved service windows or other flexible arrangements.

• Review the thresholds periodically: As Toronto’s climate continues to change, our building’s seasonal assumptions should be reassessed.

The Bottom Line

We understand the limitations of our HVAC system.

We understand contractor availability.

We understand that different units experience different temperatures.

What we do not accept is that a historical date should matter more than the conditions residents are actually living in.

We are not asking management to predict the weather perfectly.

We are asking management to use the information already available.

**Move the baseline.

Watch the forecast.
Measure the building.
Then make the switch.**

**Let the calendar tell us when to prepare.

Let the weather tell us when to switch.**

We respectfully request that the Board and Property Management review the current seasonal changeover dates and adopt an updated, climate-responsive HVAC changeover policy before the next seasonal transition.

Supporting City of Toronto guidance:
• Indoor Temperature Standards & Guidance
• Toronto Public Health — Keeping Cool During Hot Weather
• City of Toronto review of seasonal heating requirements and maximum indoor temperatures