Stacking Energy Rebates in Ontario: What Combines and What Doesn't

"Stacking" means combining more than one incentive on a single project. In the years when the federal Canada Greener Homes Grant ran alongside Ontario programs, stacking was a major part of planning a retrofit. In late 2026, the landscape is simpler, with fewer programs and stricter rules, but there is still room to combine support if you plan carefully.

This guide explains the current stacking rules, the common traps and some example scenarios. All figures are as published mid-2026; confirm on official websites before committing.

What has closed

Several programs that homeowners used to stack are no longer available to new applicants:

Program	Status
Canada Greener Homes Grant	Closed to new applicants in early 2024
Canada Greener Homes Loan (interest-free up to $40,000)	Closed to new applications in fall 2025
Federal national Oil to Heat Pump Affordability intake	Closed 31 July 2026 (Ontario stream delivered separately through Save on Energy; confirm status)
microFIT (solar feed-in tariff)	Closed since 2017

If a contractor tells you that you can still claim the Greener Homes Grant or Loan for a new project, ask them to show you where; those programs are not accepting new applications. Read more in our blog post on what to do now that the Greener Homes Loan has closed.

The core stacking rules

According to Save on Energy, the Home Renovation Savings Program (HRS) applies these rules:

Heat pumps cannot double-dip. A heat pump that has received another Enbridge, IESO or Government of Ontario incentive is not eligible for HRS.
The 100% cap. Total funding from all sources cannot exceed 100% of the cost of a measure.
Assessment stream caps. Combined assessment-stream incentives are capped at $5,000 for gas-heated homes and $10,000 for non-gas-heated homes.

In practice, "stacking" in Ontario now mostly means funding different measures through different routes, rather than funding one measure from several sources.

What can generally sit side by side

The table below shows typical combinations. "Possible" means the rules as published do not appear to prevent it, but you must still confirm eligibility for your specific project.

Combination	Generally possible?	Notes
HRS heat pump route + HRS product route (smart thermostat, appliances)	Possible	Different measures
HRS heat pump route + HRS assessment stream for insulation, windows, air sealing	Possible	Confirm how the program treats a heat pump installed during an assessment-stream project
HRS standalone attic insulation + HRS assessment stream insulation	Unlikely for the same attic	One measure, one incentive; check rules
HRS heat pump + income-qualified heat pump funding (e.g., OHPA)	No for the same heat pump	Heat pumps funded by another Ontario, IESO or Enbridge incentive are excluded
Income-qualified free insulation (EAP or Enbridge Winterproofing) + HRS heat pump	Possible	Different measures; confirm with both programs
HRS solar + battery rebate + net metering	No	Rebated systems cannot enrol in net metering for the life of the system
Municipal financing programs + provincial rebates	Often possible	Some municipalities offer local improvement charge or other financing; check with your city
Utility bill credits (OESP) + any upgrade program	Yes	OESP is a bill credit, not an upgrade incentive

Sequencing matters

The order in which you do things affects what you can claim and how well upgrades perform.

Program sequencing

Get pre-installation approval for a heat pump before work starts.
Book the pre-retrofit assessment before any assessment-stream upgrades are done; work completed before the assessment usually cannot count.
Watch deadlines. For 2026, the assessment stream reportedly requires the post-retrofit assessment to be scheduled by 30 November 2026 and work complete within 180 days of the pre-assessment or by 31 December 2026, whichever comes first.

Building science sequencing

Air seal and insulate before sizing a new heat pump or furnace, if you can. A tighter home needs smaller, cheaper equipment.
Seal the attic floor before adding attic insulation.
Fix basement moisture before insulating basement walls.

Tip: If you cannot do everything at once, ask your contractor to size a heat pump based on your planned envelope upgrades, not today's leaky house, and document that in the quote. An oversized system short-cycles and can be less comfortable.

Example scenarios (illustrative)

These examples use HRS amounts as published mid-2026 and are for illustration only.

Scenario 1: Electric baseboard home in Ottawa

Ducted or ductless cold-climate heat pump, 3 tons: $1,250 × 3 = $3,750 (heat pump route, non-gas-heated).
Assessment stream: attic and basement insulation plus air sealing and assessment completion, up to the $10,000 cap for non-gas-heated homes.
Smart thermostat compatible with the heat pump: $100 (product route), if eligible.

Scenario 2: Gas-heated home in Toronto

Hybrid system with a 3-ton cold-climate heat pump: $500 × 3 = $1,500 (heat pump route, gas-heated).
Standalone attic insulation: up to $1,250.
ENERGY STAR heat pump dryer: up to $200 (product route).

Scenario 3: Income-qualified, oil-heated rural home

Ontario Oil to Heat Pump Affordability stream (if intake is open): up to $25,000 plus $250 upfront.
That heat pump would then not be eligible for HRS.
Free insulation and air sealing through the Energy Affordability Program, if eligible.

Use our rebate finder to check what may apply to your home.

The solar decision

Solar is the clearest example of a stacking trade-off. HRS offers up to $10,000 toward rooftop solar plus battery storage, but rebated systems operate as load displacement and cannot use net metering for the life of the system. Under net metering, exported energy earns kWh credits at the retail commodity value that roll forward for up to 12 months. For many homes, keeping net metering may be worth more over 25 years than the rebate. See our solar rebate vs net metering guide.

Stacking checklist

List every upgrade you are considering and which route each would use.
Check each program's rules on other funding sources.
Confirm contractor participation for each program.
Get pre-approvals in writing before any work starts.
Keep a single folder of invoices, approvals and assessment reports.
Make sure total incentives on any one measure do not exceed its cost.
Confirm current status of every program on its official website.

Frequently asked questions

Can my contractor handle all the rebate paperwork?

Participating heat pump contractors submit some documentation directly, but you remain responsible for your application. Keep your own copies of everything.

Do rebates count as taxable income?

Tax treatment can depend on your situation, particularly for rental or business-use properties. We do not give tax advice; ask a tax professional or check with the Canada Revenue Agency.

What happens if I accidentally claim the same measure twice?

Programs can deny or claw back incentives. If you realize there is overlap, contact the programs before payment is issued.

Will new federal programs open?

We do not speculate on unannounced programs. Watch natural-resources.canada.ca for official announcements.