Read the NFRC label: U-factor and SHGC
Every rated window carries a National Fenestration Rating Council label. Two numbers matter most for Reno. U-factor measures how well the product keeps heat from escaping; lower is better, with window values running from 0.20 to 1.20. SHGC (solar heat gain coefficient) measures how much solar heat the product lets in, on a scale of 0 to 1. The label rates the whole window, frame and glass together, not the glass alone.
In Reno's climate you care about both. The city sees about 122 days a year at or below freezing, so a low U-factor keeps heat in. It also sees about 65 days at or above 90°F and bright sun, so SHGC decides how much of that heat comes through the glass.
Reno code vs ENERGY STAR
Two different benchmarks get mixed up. One is a legal minimum at inspection. The other is a voluntary, tighter target.
| Benchmark | U-factor | SHGC | Status |
|---|---|---|---|
| City of Reno EZ Permit (replacement windows) | 0.30 or better | Not stated | Required; labels checked at inspection |
| ENERGY STAR v7.0, Northern zone | 0.22 or lower | 0.17 or higher | Voluntary certification |
| ENERGY STAR v7.0, North-Central zone | 0.25 or lower | 0.40 or lower | Voluntary certification |
| ENERGY STAR v7.0 patio doors, Northern zone | 0.26 or lower | Not listed here | Voluntary certification |
City of Reno's EZ Permit sheet (updated July 2025) cites a minimum U-factor of 0.30 under 2024 IECC R402.1.2 for window replacement. Washoe County adopted the 2024 IECC, effective July 1, 2025, with compliance required on all submittals from January 1, 2026, and Nevada adopted it statewide in August 2024. ENERGY STAR version 7.0 took effect October 23, 2023. It also offers equivalent-performance options in the Northern zone at U 0.23 to 0.24 with SHGC of 0.35 or higher, and U 0.25 to 0.26 with SHGC of 0.40 or higher. Air leakage must be 0.3 cfm per square foot or lower.
ENERGY STAR's map places Reno and Washoe County in the Northern zone. A North-Central band covers parts of western and central Nevada, and Carson City, Douglas and Lyon sit near the boundary, so confirm those counties with ENERGY STAR's Climate Zone Finder.
Low-E, gas fills and glass packages
Low-E coatings
Low-emissivity coatings are transparent metallic layers, thinner than a human hair, applied to the glass surface. They reduce heat flow through the window. Different coatings favor winter heat retention or summer solar control, so the right coating for a south-facing great room in Reno may differ from a north bedroom. Fixr lists low-E glass at $300 to $1,100 per window as a glass-type upgrade; this is a national figure, and Reno quotes vary.
Argon and krypton
Argon and krypton fills block more heat transfer than air because they are denser. Leakage for an efficient window is about 0.5% of the gas fill per year, so even after 20 years a window with gas leaks would still perform at about 90% of its original capacity, according to the Efficient Windows Collaborative.
Double or triple pane
Triple glazing is the most efficient option and costs more. A 2026 This Old House survey averaged $529 for double and $609 for triple, about 15% more. See double vs triple pane windows for where the extra pane helps in Reno.
Frame and style affect the rating
The frame is part of the NFRC number. Fixed picture windows have no operable sash and often rate best for air leakage, while operable styles such as sliding and double-hung windows have more edges to seal. Casement windows compress against the frame when closed. Material affects both the rating and upkeep; compare them in window frame materials.
Install quality counts as much as the label. Air leaks around the frame, missing insulation in the gap and poor flashing undo a good rating. Ask the installer how the perimeter is sealed and whether the new window is installed as an insert or full-frame; see retrofit vs full-frame windows.
Incentives: what has ended and what is unconfirmed
- Federal 25C credit: it was 30% of cost, capped at $600 for windows and skylights. The IRS says it is not allowed for property placed in service after December 31, 2025, so it has ended.
- NV Energy: no window rebate is confirmed. The programs found cover thermostats, appliances, audits and AC, not windows. Do not count on a utility rebate for windows without written confirmation.
- Nevada HOMES and HEAR: aggregator sites say the programs had not opened to public applications as of mid-2026. The listed HEAR measures are heat pumps, water heaters, panels, wiring and weatherization such as insulation and air sealing. Windows are not listed.
Check current status with NV Energy and the Nevada Governor's Office of Energy before assuming any incentive applies. Savings from lower heating and cooling bills are real but depend on your existing windows, house and usage, so ask the installer for an estimate in writing rather than a general claim.
Before you order
- Ask for the NFRC label values (U-factor and SHGC) for the exact window and glass option quoted.
- Compare against Reno's 0.30 minimum and the ENERGY STAR Northern target of 0.22.
- Ask which low-E coating and gas fill are used, and which wall orientations they suit.
- Check the permit: City of Reno treats window replacement as permitted and checks labels at inspection; Washoe County exempts same-opening, same-size replacement in unincorporated areas; confirm Sparks and Carson City with the building department.
- In wildland-urban interface areas, confirm the glazing meets the property's ignition-resistance requirements.
Request a match and we connect you with a licensed local installer who can quote the same windows at more than one performance level. For prices see window replacement cost in Reno.
Main guide: window replacement in Reno, NV.