IECC Climate Zone 2

Insulation Standards for
Phoenix, AZ

In Phoenix's intense Zone 2 heat, proper attic insulation (R-49) is crucial to stop attic heat from radiating into your living space.

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Retrofit Target
R-38
Recommended
New Code (2021)
R-49
Strict Standard
Climate Type
Hot (TX, FL, AZ)
Source: DOE / IECC

Estimated Insulation Costs in Phoenix

Material TypeCost per Sq. Ft.Avg. 1000 sq.ft. Project
Blown-in Fiberglass$1.80 - $3.00$1800 - $3000
Spray Foam (Closed Cell)$4.50 - $7.50$4500 - $7500
Estimates based on Zone 2 material requirements. Local labor rates in AZ may vary.

Why Insulation Matters in Phoenix

Living in Phoenix means dealing with the specific thermal challenges of Climate Zone 2. According to the 2021 International Energy Conservation Code (IECC), homes in this region require specific thermal protection to maintain efficiency and comfort.

💡 Local Energy Tip

Many homes built before 2010 in the 85001 area typically have insulation levels between R-15 and R-30. Upgrading to R-38 is often the single most effective way to lower your utility bills.

Recommended Materials for Zone 2

  • Blown-in Cellulose: Excellent for filling gaps and settling over existing insulation in older Phoenix attics.
  • Spray Foam: Provides both high R-value and air sealing, crucial for preventing drafts in Zone 2.

Ready to Upgrade?

Don't guess with your energy bills. We recommend getting quotes from at least 3 licensed insulation contractors in AZ to compare pricing.

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