Ontario's commercial HVAC contractors have a narrow window to act before the next round of Ontario Save on Energy Retrofit Program changes takes effect. The IESO, which administers the province's Retrofit Program under the Save on Energy brand, rolled out its Spring 2026 updates in two phases this year, with the first set already live since May 29 and a second, more consequential round of incentive cuts and measure changes landing on June 30, 2026. For contractors with active or near-term commercial efficiency projects, especially anything involving packaged terminal heat pumps or bundled solar, the next few days matter for what incentive level a project actually qualifies for.
What Changed on May 29
The first wave of Ontario Save on Energy Retrofit Program changes split the Prescriptive Packaged Terminal Heat Pump measure, commonly used in hotel and motel suite retrofits, into two distinct tiers. New installations now qualify for an incentive only when used in hotel and motel suites, based on expected baseline performance, the same requirement as before. Replacements of existing packaged terminal air conditioners or electric resistance heating systems now fall under a separate tier with its own eligibility rules. The IESO also removed eligibility for wall-mounted solar distributed energy resources entirely and updated the solar DER worksheet so applicants must now enter a specific tilt angle rather than choosing the closest option from a dropdown menu, a change aimed at improving savings calculation accuracy.
For contractors doing hospitality retrofit work, this is not a cosmetic change. A hotel swapping out aging PTAC units for heat pumps now needs to confirm which tier its project falls under before submitting an application, since the eligibility criteria and expected baseline calculations differ between new installation and replacement scenarios.
What Changes on June 30
The second and more financially significant round of Ontario Save on Energy Retrofit Program changes takes effect June 30. The IESO is cutting the incentive for small-to-medium generation solar DER systems above 10 kilowatts by 10 percent, from $860 per kilowatt to $770 per kilowatt of AC nameplate capacity. LED grow light incentives for vegetable and cannabis warehouse applications drop 10 percent as well, while horticultural lighting controls and network lighting controls incentives fall 15 percent. On the positive side, the IESO is introducing a new Prescriptive Clean Water Pump measure, offering a $15-per-horsepower incentive for qualifying energy-efficient pumps, a new revenue lever for contractors who handle pump replacements alongside commercial HVAC and plumbing upgrades.
Critically, the IESO has confirmed that applications submitted before June 30 for measures facing incentive reductions will still be honored at the current, higher incentive levels. That creates a real and immediate filing deadline for any commercial project bundling solar DER, horticultural lighting, or network lighting controls with HVAC work.
Why This Is Part of a Predictable Cycle, Not a One-Off
These changes are not arbitrary. The IESO has run semi-annual updates to the Retrofit Program since 2021 as part of its broader Conservation and Demand Management framework, with each cycle adjusting incentive levels to reflect market conditions, measure costs, and program participation data. The next update is already expected for Fall 2026, which means contractors who build a habit of checking IESO program news every six months will consistently have a financial edge over those who only notice changes after a client's expected rebate comes back lower than quoted.
For Ontario contractors who frequently bundle HVAC retrofit work with adjacent measures, lighting, solar, or now water pumps, treating the Retrofit Program's update calendar as a standing part of project scheduling, rather than a surprise twice a year, is becoming a genuine competitive advantage.
The same logic applies across the rest of Canada. Provincial efficiency programs from British Columbia's CleanBC streams to Quebec's LogisVert rebates follow their own update cycles, and contractors who build a habit of checking program calendars before quoting a job, rather than after a client questions a rebate number, consistently capture more of the incentive value on the table.
