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Ameren Illinois home insulation discounts open

Administered by Ameren Illinois, through the Ameren Illinois Energy Efficiency Program (Home Efficiency Market Rate).

Ameren Illinois pays $1.10 a square foot for attic and wall insulation, $2 a linear foot for rim joists, $3 a linear foot for crawl space walls and $0.70 per CFM of air leakage cut, off a Program Ally's invoice after a home assessment. Any income; the home must be heated by gas or electricity that Ameren delivers.

source · verified 27 September 2026 · amounts in US dollars

What it pays

2026 discount rates, off the Program Ally's invoice
UpgradeConditionUp to
Attic insulationPer square foot$1.10
Wall insulationPer square foot of empty exterior wall cavity$1.10
Rim joist insulationPer linear foot$2.00
Crawl space wall insulationPer linear foot; may need a ground vapor barrier$3.00
Air sealingPer CFM of air leakage reduced; pre-approval before work starts$0.70
Exhaust ventilationASHRAE ventilation, per home$25

Ameren publishes rates, not a maximum per home: the Program Ally's assessment decides the work.

Who is eligible

who
Any Ameren Illinois customer whose heating fuel Ameren delivers, gas or electric, at any income. No application or income check.
contractor
A registered Ameren Illinois Program Ally, BPI-certified, who assesses the home and takes the discount off the invoice.
financing
The rest can go on the utility bill: $500 to $20,000 at a fixed 7.49% for 1 to 10 years through the Illinois Energy Efficiency Loan.

Where the application goes

Through a Program Ally, who does the assessment and applies the discount.

Where the application goes
If this is youApply here
Find a Program Allyamerenillinoissavings.com
Phone1-866-838-6918

The thing most pages get wrong

Illinois's two big electric utilities treat insulation opposite ways. In ComEd's territory nobody above 80% of area median income gets an electric-utility insulation rebate; in Ameren's, anyone heated by Ameren gas or electricity does, at $1.10 a square foot. The difference is the utility, not the income.

The loan rate moved

Nicor Gas told contractors in December 2025 that the on-bill loan was 7.74%. The lender's page now says 7.49% fixed. Loans over $8,000 can run 7 or 10 years; for a rental, the utility account must be in the owner's name.