Spray foam insulation in Tempe, AZ: get up to 3 quotes from vetted local installers
Request free quotes from up to three vetted spray foam installers serving Tempe and nearby Maricopa County. Below: what your climate zone means for open vs closed cell, how much insulation to ask for, Arizona's energy code, and the rebates we could verify.
- Climate zone: 2B (2021 IECC)
- Attic target: R-49 (ENERGY STAR, uninsulated attic)
- State code: No mandatory statewide residential energy code
- Utility rebates we verified: SRP Insulation Rebate
- Federal 25C credit: ended for 2026 installs
Facts last checked October 16, 2026. Sources are linked in each section.
Where we match quotes from this page
Requests from Tempe and ZIP codes whose center is within about 20 miles of it go to our Tempe, AZ partner installers (21 ZIP codes): 85008, 85026, 85034, 85040, 85041, 85042, 85044, 85045, 85048, 85201, 85202, 85210, 85250, 85251, 85256, 85257, 85281, 85282, 85283, 85284, 85339. Outside these? Send the form anyway and we'll tell you if we can't match you.
Climate zone 2B: what it means for spray foam
Tempe's central point is in Maricopa County, which the 2021 IECC county map assigns to climate zone 2B (hot-dry in DOE's Building America terms). Zone 2B is a dry ("B") zone, which drives the vapor and R-value rules below.
Other counties within our Tempe service radius: Pinal County (2B). All are zone 2B too.
Source: PNNL-33270, Guide to Determining Climate Zone by County (IECC 2021).
Open cell vs closed cell in Tempe, AZ
Attic roofline: in climate zones 1–3 an unvented ("sealed") attic with open-cell foam sprayed under the roof deck is a common way to bring attic ductwork and air handlers inside the insulated envelope. The International Residential Code (Section R806.5) allows unvented attics with air-impermeable insulation such as spray foam; for a hybrid "flash-and-fill" assembly the foam layer at the deck must be at least R-5 in zone 2B.
Dry climate note: zone 2B is a dry ("B") zone, so winter condensation in roof sheathing is less of a concern than in humid regions; the bigger issue is extreme attic heat, which is why roofline foam and duct location matter.
Closed cell earns its higher price where you need a vapor retarder or water resistance: crawlspace walls, rim joists, below-grade walls.
How much insulation to ask for
| Where | ENERGY STAR recommendation for zone 2B |
|---|---|
| Attic, uninsulated | R-49 |
| Attic with 3–4" of existing insulation | add R-38 |
| Floor over unconditioned crawlspace/basement | R-13 |
To reach R-49 with foam alone you'd need roughly 13.2–14.0" of open cell (about R-3.5 to R-3.7 per inch) or 7.0–9.8" of closed cell (about R-5 to R-7 per inch). Many roofline spray foam jobs are installed thinner than that and justified through the code's performance path or the unvented-attic rules, so ask every installer to write the foam type, thickness and resulting R-value on the quote and explain how it meets your local code.
Source: ENERGY STAR, Recommended Home Insulation R-Values (based on 2021 IECC). ENERGY STAR's figures are recommendations for existing homes; your local code sets the legal minimum for new work.
Arizona energy code
No mandatory statewide residential energy code. Codes are set city by city. NAHB lists Phoenix as having adopted the 2024 IECC with minimal amendments and Tucson as having adopted the 2024 IECC with amendments. Other Valley cities adopt their own editions, so ask the installer which code your city enforces.
Source: NAHB, "Residential Provisions of the IECC: State Adoption Status" (current as of May 2026); official state status at DOE Building Energy Codes Program.
Homes in Tempe, AZ
Census figures for Tempe city (ACS 2020–2024 5-year estimates): about 86,182 housing units, a median year built of 1984, 41% built before 1980 and 14% built in 2010 or later. 38% are single-family detached homes and 2% are mobile/manufactured homes. 42% of occupied homes are owner-occupied, with a median owner-reported home value of $455,400.
- With 41% of homes built before 1980, many attics here predate modern energy codes. Older attics often need old insulation removed or air-sealed first, and knob-and-tube wiring must be checked before any insulation covers it. Ask whether removal and prep are in the price.
- 78% of homes heat with electricity (furnaces, heat pumps or baseboard). Several utility insulation rebates are aimed at electric-heat or central-A/C customers, so check the programs below.
Rebates and incentives for Tempe, AZ
Utility programs that may apply, depending on which utility serves your address:
SRP Insulation Rebate
Up to 75% of installed cost, capped at $600, to bring attics with less than R-19 up to R-38, installed by a participating BPI-certified, Arizona-licensed contractor; air sealing is required unless documented as unnecessary. New construction and mobile homes are excluded.
Read on the program's own page October 16, 2026. Programs change; confirm before you sign.
APS
We could not find a current general insulation rebate for APS customers (APS offers income-qualified weatherization). Arizona's state Efficiency Arizona program may help income-eligible households.
Read on the program's own page October 16, 2026. Programs change; confirm before you sign.
Arizona state Home Energy Rebates
Open (some programs) Efficiency Arizona
Electrification/appliance rebates (HEAR): "Applications are still being accepted, but must meet the new program guidelines."
Max rebate (per official page): Rebates cover a percentage of the total project costs, up to $14,000 per household, depending on income level.
Official source: https://efficiencyarizona.com/. Status text compiled via referencesource.org, last checked by them September 29, 2026. Full Arizona rebate page →
What spray foam costs (national published ranges)
We don't have enough local quotes for Tempe, AZ to publish local prices, and we won't make them up. These national ranges are a starting point; your installers' quotes are what count.
| Example job (typical thickness) | Estimated installed range |
|---|---|
| 1,000 sq ft attic roofline, open cell (6") | $3,600–$9,600 |
| 1,000 sq ft attic roofline, closed cell (3") | $3,900–$9,300 |
| 1,500 sq ft walls, open cell (3.5") | $3,150–$8,400 |
| 1,500 sq ft walls, closed cell (2") | $3,900–$9,300 |
| 200 sq ft rim joists, closed cell (2") | $520–$1,240 |
Board feet × Angi's 2026 installed price per board foot. Angi reports a national average spray foam project of $2,888 (typical $1,455–$4,337). Check a quote you already have →
Questions to ask each installer
- Foam type, brand, thickness and resulting R-value for each area, in writing.
- Which climate zone and code edition they're designing to.
- Whether removal of old insulation, air sealing, and any required ignition/thermal barrier coating are included.
- Whether they participate in SRP Insulation Rebate or the other programs above, and who files the paperwork.
- Whether they'll do (or coordinate) combustion safety testing if you have gas appliances.
FAQ
What climate zone is Tempe, AZ in?
Maricopa County is IECC 2021 climate zone 2B, per PNNL's county list (PNNL-33270).
Should I use open-cell or closed-cell spray foam in Tempe, AZ?
For attic rooflines in zone 2B, open cell is common and code-permitted in unvented attics; closed cell is worth the premium for crawlspace walls, rim joists and metal buildings.
How much attic insulation do homes in Tempe, AZ need?
ENERGY STAR recommends R-49 for an uninsulated attic in zone 2B (or adding R-38 on top of 3–4 inches of existing insulation). Arizona's code: No mandatory statewide residential energy code.
Are there spray foam or insulation rebates in Tempe, AZ in 2026?
The federal 25C tax credit does not apply to insulation installed after December 31, 2025. Utility programs that may apply, depending on which utility serves your address: SRP Insulation Rebate; APS. Arizona's state Home Energy Rebate program status: Open (some programs).
How much does spray foam cost in Tempe, AZ?
We don't publish local prices until we have enough real local quotes. National published ranges are about $0.60–$1.60 per board foot for open cell and $1.30–$3.10 for closed cell, installed (Angi, 2026), and many companies have a $1,000–$2,000 minimum.
How does requesting quotes work?
Fill in the form once. We pass your request to up to three vetted partner installers who serve Tempe, AZ, and they contact you to schedule an estimate. It's free and there's no obligation.
Other areas we serve in Arizona
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