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Red tile roof

Cool roofs

Cool Roofs reflect solar energy and discharge stored heat. So they have both high reflectivity and high emissivity. Compared to standard roof surfaces, Cool Roofs stay 50 degrees to 60 degrees cooler on hot summer days. And that keeps cooling costs down. Watch a SMUD video to learn more.

Homeowners win with:
  • Lower cooling costs
  • Reduced A/C equipment wear
  • Longer roof life
  • Greater comfort
Our community wins with:
  • Cooler neighborhoods (reduced "Urban Heat Island" effect)
  • Lower energy demand during peak cooling periods
  • Less air pollution
  • Less roofing waste sent to landfills

Save money

Help reduce SMUD's electricity peak demand and air conditioning energy load and mitigate the overall urban heat island effect in the Sacramento area. The Cool Roof program provides the following incentive to homeowners when the roofing contractors install products that meet at least the following SMUD's solar reflectivity and emissivity standards:

Residential Roof Type Solar Reflectivity / Thermal Emissivity SMUD Cool Roof Rebate
Pitched 25% or higher reflectivity (Energy Star)
75% or higher emissivity
$0.10/sq. ft. of the air-conditioned area under the roof
Pitched 40% or higher reflectivity
75% or higher emissivity
$0.20/sq. ft. of the air-conditioned area under the roof
Flat 85% or higher reflectivity
75% or higher emissivity
$0.30/sq. ft. of the air-conditioned area under the roof

Your choices:

Cool Roofs for flat roofs come in three main types:

  • Coatings
    Best used on existing roofs in good condition. These are applied by spraying or rolling. The most common type of cool coatings is the elastomeric coating.
  • Single-ply membranes
    Pre-fabricated sheets applied in a single layer and heat-sealed for a continuous bond. A lot more expensive than cool roof coatings, but yield much better quality and better overall performance. Good for use on new roofs or on those in need of extensive repair.
  • Sprayed polyurethane foam (SPF)
    SPF coatings are lightweight, easy to apply, and provide good insulation and waterproofing. A spray gun is used to combine two separate ingredients on the site. Instantaneous chemical reaction causes the mixture to expand and create hard foam. However, the SPF requires cool roof coatings to be applied over it, in order to protect the foam against degradation.

Cool Roofs for pitched roof types:

  • The products with 40% or higher initial solar reflectance are most commonly the light weight, light color roof tiles made of concrete or clay, coated metal roofs, wood cedar shakes, or a few asphalt shingle products (for example, CertainTeed — Landmark Solaris Platinum collection — Sierra Buff 41%, Coastal Tan 40%, and Sante Fe 40%). Asphalt shingle products that have the Energy Star label (25% or higher initial solar reflectance) also qualify, but with lower rebate level. Bare metal roofs do not qualify for the rebate because bare metal roofs have low emissivity, meaning they retain heat.

Search a list of Cool Roof products.

To qualify for SMUD rebates:
Roofing products need to be listed on the EPA Energy Star® product list, and must meet SMUD's minimum standards for solar reflectivity and thermal emittance: To locate the list of eligible products, please visit (Cool Roof Rating Council) and search the site under the "Rated Products Directory" for products with SMUD's minimum standards for solar reflectivity and thermal emittance. Please make sure that contractor's invoice and cool roof rebate application form contain information about the product installed (manufacturer's name and product brand). All residential mobile homes and single-family homes must have an electrical central air conditioning (AC) system. Wall AC units are not eligible for rebates. New construction projects are not eligible for rebates.

The following three (3) documents are required to process any rebate request:

  1. Complete the Cool Roof rebate form.
  2. Provide a copy of the product invoice (if the product is self-installed) or a copy of the contract with the roofing contractor.
  3. Provide a copy of the building permit for this roofing retrofit project.

Mail all three documents to:
Sacramento Municipal Utility District
Residential Cool Roof Program, MS A203
P.O. Box 15830
Sacramento, CA. 95852-0830

Or email all three documents to:

For more information call (916) 732-6484 or e-mail us.

Cool Roofs

Cool roofs save you about 20 percent.

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