Cooler, wetter weather is settling into the Tri-Cities this week — the kind of stretch that tends to expose a furnace that's been coasting since spring. For homeowners who heat with Cascade Natural Gas, it's also a good window to line up a rebate before contractors book solid for the season.
Cascade's current residential rebate schedule applies to qualifying equipment installed on or after March 15, 2026, and it's still the active program, according to the utility's rebate page. That means any furnace replacement, tune-up upgrade or weatherization project completed this fall falls under these rules, not whatever schedule was in place last winter.
The rebates are separate from the insulation and air-sealing incentives Benton and Franklin PUD have been offering electric customers, which Tri-Cities Today covered in an Oct. 4 guide, "Benton, Franklin PUDs will pay Tri-Cities homeowners to insulate and air-seal before winter." Cascade's program is specific to natural gas equipment and natural gas customers, and the two aren't interchangeable.
Who actually qualifies
Cascade's rules are narrower than some homeowners expect. To qualify for a residential rebate, you generally need to:
- Be billed under Cascade's residential rate schedule 503
- Have the work done at a residential address, not a rental converted to commercial use or a commercial property
- Use natural gas as your home's primary heat source — a gas furnace that backs up an electric heat pump doesn't qualify for heating or weatherization rebates
Those conditions come straight from Cascade's residential rebate offerings page. If you're not sure which rate schedule you're on, it's printed on your monthly Cascade bill.
The furnace rebate's efficiency bar
If you're replacing a failing furnace this fall, pay attention to the efficiency rating before you sign a contract. Cascade's own application instructions are blunt about it: "If applying for a furnace rebate, please note only furnaces 95% AFUE or higher are eligible for a rebate," according to the residential rebate application page.
AFUE (annual fuel utilization efficiency) measures how much of the fuel a furnace burns actually turns into heat for your house, versus what goes up the flue. A furnace rated below 95% AFUE won't qualify, no matter how new it is. Ask your contractor for the AFUE rating in writing before installation, not after.
What you'll need to apply, and how long it takes
Homeowners filing for a rebate need their Cascade Natural Gas account number and invoices for the installed equipment, per the application page. For insulation and air-sealing work specifically, Cascade requires homeowners to use a contractor listed in its Trade Ally Directory, part of the Washington Conservation Incentive Program.
Don't expect a quick turnaround. Cascade tells customers to "allow eight to twelve weeks" for the company to process Washington residential incentive applications, according to the rebate offerings page. File before Thanksgiving and a rebate check might not land until well into the new year.
A lesser-known option: the Weatherization/Infrastructure Program
Beyond the standard rebates, Cascade runs an income-qualified program called the Weatherization/Infrastructure Program, or WIP, that most homeowners never hear about. It covers smoke detectors, carbon monoxide detectors, furnace tune-ups, and pest and moisture control measures, according to a February 2026 tariff filing Cascade submitted to the Washington Utilities and Transportation Commission.
WIP can also cover a full furnace replacement, but only when the existing furnace is failing, at the end of its service life, or running inefficiently, and only if the replacement furnace has a savings-to-investment ratio of 1.0 or higher, as determined by the program administrator, per that same filing. In plain terms, the math has to show the new furnace will save more in fuel costs than it costs to install before WIP will pay for it.
The filing doesn't list income thresholds or a local Tri-Cities contact number, so homeowners who think they might qualify should call Cascade directly to ask about WIP eligibility and the application process.
Why this matters with rates already climbing
Tri-Cities Today reported last month that gas, water and sewer rates are headed up across the region. A furnace that's still burning at 80% efficiency, pushing a fifth of every dollar of gas out the flue, costs more every winter that rates climb. Locking in a rebate now, while this schedule is active, is one of the few ways homeowners can offset part of that increase rather than just absorb it.
If your furnace isn't failing outright but hasn't had a tune-up in a while, this week's cooler, wetter stretch is a reasonable prompt to get one scheduled before contractors fill up with emergency no-heat calls once temperatures actually drop.
Furnace rebate checklist
- Confirm you're on Cascade's residential rate schedule 503
- Confirm gas is your primary heat source, not backup to a heat pump
- Get your furnace's AFUE rating in writing — 95% or higher to qualify
- Save your Cascade account number and equipment invoices
- Use a Trade Ally Directory contractor for insulation/air-sealing work
- Submit the application promptly and plan on an eight- to twelve-week wait
- Ask Cascade directly about WIP if income or an aging furnace might qualify you
Frequently asked questions
Does a new furnace with 90% AFUE qualify for any Cascade rebate? No. Cascade's application materials specify that only furnaces rated 95% AFUE or higher are eligible for a rebate.
Can I get a rebate if my gas furnace just backs up a heat pump? No. Cascade's heating and weatherization rebates require natural gas to be the home's primary heat source, not a backup system.
How is the Weatherization/Infrastructure Program different from the standard rebate? WIP is income-qualified and covers items like smoke detectors, carbon monoxide detectors, tune-ups and moisture control, and it can fund a full furnace replacement only when the old furnace is failing or inefficient and the new one meets a savings-to-investment ratio of 1.0 or higher.
How long will I wait for a rebate check? Cascade says to allow eight to twelve weeks for Washington residential applications to process once submitted.
