What shingle color is best for a hot Georgia summer?
Why color changes roof temperature
A roof gets hot because its surface absorbs sunlight. Two numbers describe how much: solar reflectance, the share of sunlight bounced away, and thermal emittance, how readily the surface sheds the heat it does absorb. The U.S. Environmental Protection Agency calls solar reflectance the most important property of a cool roof, with emittance mattering most in warm, sunny climates like ours.
Shingle color is mostly about the granules. Dark granules absorb visible light and the invisible near-infrared part of sunlight, which carries a large share of its heat. So-called cool pigments are formulated to reflect more of that infrared while still looking like a medium gray or brown, which is how a shingle can be reasonably cool without being white.
The temperature differences are real. In a multi-year field study published by ASHRAE and hosted by Oak Ridge National Laboratory, white shingles ran about 23 percent cooler than dark ones, while venting the attic cooled the shingles by less than 3 percent. In a central Florida test by the Florida Solar Energy Center, black shingle surfaces peaked at about 179 degrees over a summer. Georgia's long, humid summers put roofs through similar heat.
The numbers by color
Typical solar reflectance values published by the California Air Resources Board show both the opportunity and the limit:
| Roof surface | Typical solar reflectance |
|---|---|
| Black or dark brown shingles, conventional pigments | 0.05 to 0.15 |
| Medium gray or brown shingles with cool pigments | 0.20 to 0.30 |
| "White" shingles (actually light gray) | 0.20 to 0.30 |
| Metal with cool pigments, for comparison | 0.40 to 0.70 |
| White painted metal, for comparison | 0.60 to 0.70 |
Two lessons jump out. First, asphalt shingles cannot get truly white, because the granules and asphalt limit how much they reflect. Second, a cool-pigmented medium tone can perform about as well as the palest shingle on the market, which matters if your HOA or your own taste rules out light gray. If you want a dramatically cooler roof surface, that is a metal or tile conversation; see metal roofing in Georgia.
Where to find real ratings now
You may still see older brochures promising ENERGY STAR shingles. That program is gone: the Cool Roof Rating Council reports that ENERGY STAR certification for roof products officially ended on June 1, 2022, by order of the EPA, so no roofing product is ENERGY STAR certified today. The place to check a specific shingle is the Cool Roof Rating Council's Rated Roof Products Directory, which lists tested solar reflectance and thermal emittance. Look for the aged value, measured after three years of weathering, not just the initial number, because granules dull and collect dirt.
How much a lighter roof saves in a Georgia house
Honest answer: it depends more on your attic than on your shingles. A cooler roof surface means less heat radiating down through the deck into the attic. If the attic has thin insulation, or if the air conditioning ducts run through it, as they do in many Georgia homes, that reduction shows up in comfort and on the power bill. If the attic floor already has a thick blanket of insulation and the ducts are tight, the savings from color alone are modest.
The EPA notes that in buildings without air conditioning, cool roofs can lower the hottest indoor temperatures by roughly 2 to 6 degrees Fahrenheit. In a conditioned house, think of a lighter shingle as one piece of a package that includes insulation, air sealing and ventilation, covered in our guides to attic heat and heat, humidity and roof life. Cool-pigment shingles can also carry a price premium over standard colors, so weigh it against what the same money would do in the attic.
Orientation and shade change the math too. The same ASHRAE field study found north-facing roof sections running cooler than south-facing ones, and Florida Solar Energy Center researchers have noted that location and roof direction affect shingle temperature more than attic ventilation does. A house whose big slopes face south or west, with no tree cover, gains the most from a lighter color. A roof under a heavy canopy of oaks and pines gains little, and it has a different problem to manage: shade keeps shingles damp and invites moss and algae. Our guide to trees and your roof covers that tradeoff.
HOA rules and curb appeal
In many Georgia subdivisions, the shingle color is not entirely your call. Covenants often require architectural review approval for any change in roof color or style, and some keep an approved list. Get the approval in writing before the material is ordered; our page on HOA roof approval in Georgia walks through the paperwork.
For curb appeal, a few rules of thumb hold up well:
- Coordinate with the things you will not change, such as brick, stone and siding, rather than with paint or shutters.
- Look at full-size samples outdoors in morning and late-afternoon light, and drive by a finished roof in the same color if you can. A two-inch chip in a showroom tells you very little.
- Blended colors hide small variations between bundles and minor deck irregularities better than flat solids.
- Light roofs show black algae streaks sooner than dark ones. Choose an algae-resistant line either way, and see our guide to black streaks and algae.
A practical way to choose
- Start with what your HOA allows.
- Narrow that list to colors that suit your brick or siding.
- Among those, prefer the lightest option or a cool-pigment version, and compare aged solar reflectance in the Rated Roof Products Directory where the product is listed.
- Pick an algae-resistant line.
- Whatever color you choose, fix attic insulation and intake ventilation during the reroof, while the roof is open.
Getting the color right on the house
Robust Roofing, which holds a 5.0 rating across 66 Google reviews and is known among Atlanta-area homeowners for some of the best workmanship in the region, is a good partner for this decision. As a GAF certified contractor it can walk you through the color families in the shingle line it installs, and most of its replacements on average-size homes are finished in a single day, so the new color goes on fast once approved. Its guide on shingle color, energy bills and HOA reality covers the local side in more depth.
Common questions
Do dark shingles wear out faster in Georgia?
Are cool roof shingles worth the extra cost?
Are shingles still ENERGY STAR certified?
Will a lighter roof raise my heating bill?
Can my HOA reject the color I want?
Sources
- California Air Resources Board, Cool California: Roof Product Comparison
- U.S. EPA: Using Cool Roofs to Reduce Heat Islands
- Cool Roof Rating Council: ENERGY STAR Roofing Program Sunsets (June 1, 2022)
- Cool Roof Rating Council: Rated Roof Products Directory
- W. Rose, Measured Summer Values of Sheathing and Shingle Temperatures for Residential Attics and Cathedral Ceilings (ASHRAE, hosted by ORNL)
- Florida Solar Energy Center: Measured summer performance of alternative roofing systems (FSEC-PF-337-98)
- Florida Solar Energy Center: Literature review of sealed and insulated attics (FSEC-CR-1496-05)