These four windows are the most common budget choices for new builds, rentals, and flips — the in-stock vinyl windows from Lowe's and Home Depot, our local Texas-made option, and a name-brand value line. They're all good tools for the right job. This guide explains every rating in plain English, then shows exactly how the four stack up.
What the Numbers Mean
- The NFRC Label — Every certified window has one. It lists the whole-window U-Factor, SHGC, VT, and air leakage. Always compare these whole-window numbers between brands, never the “center-of-glass” figures used in marketing.
- U-Factor — How well the window insulates against heat passing through. Lower is better. Target for the Texas climate is 0.28 or below — it keeps your A/C from fighting the outdoor temperature.
- SHGC — How much of the sun's heat the glass blocks. The most important number for East Texas. Target is 0.23 or below, to stop the afternoon heat from coming through the glass.
- DP Rating — Rates the window's structural strength against wind and pressure. Higher is more durable — matters for East Texas storm season and wind-driven rain.
- Air Leakage (AL) — Measures air drafts through the unit. Lower is a tighter seal. An AL of 0.3 or below is good — a leaky window wastes the glass performance you paid for.
- Warranty — Always check three things: is it transferable to the next owner, does it cover labor, and is the glass seal covered (and for how long)? A warranty is only as good as the company standing behind it.
- In-Stock vs. Ordered — “In-stock” windows come in fixed standard sizes you can grab today. Contractor-direct windows (Elevate, Simonton) are built to your exact opening with new-construction nail fins — often cheaper per unit and a better fit, with a shorter lead time than bigger brands.
The Comparison
| Window | Frame | U-Factor | SHGC | DP | Warranty | Where to Buy | Price |
|---|---|---|---|---|---|---|---|
| RELIABILT Lowe's house brand (by Atrium) |
Vinyl | 0.29–0.31 | 0.18–0.21 | 30–50 | Transferable limited lifetime; 30-yr prorated glass seal | Lowe's only (in-stock & special order) | $ |
| Ply Gem Home Depot (Cornerstone Bldg. Brands) |
Vinyl | 0.27–0.30 | 0.22–0.27 | 15–50 | Varies by series; in-stock 500: 1-yr + 10-yr glass | Home Depot & distributors | $ |
| Elevate Inspire Series · Grand Prairie, TX |
Vinyl | 0.28–0.30 | 0.20–0.23 | 35–60 | Limited lifetime (vinyl) | TX distributors (ABC Supply Co) | $ |
| Simonton Pro Finish Contractor Series (Cornerstone Bldg. Brands) |
Vinyl | 0.30–0.35 | 0.21–0.27 | 35–50 | Transferable limited lifetime (residential) | Simonton dealers & Home Depot | $$ |
On paper, all four are nearly a tie — they're all vinyl with Low-E + argon glass, so the energy numbers land in the same narrow band. The real differences are the warranty, who's standing behind it, and how well the window gets installed.
Window by Window
RELIABILT (Lowe's House Brand)
Lowe's private label window, manufactured by Atrium, a known large U.S. manufacturer, and generally regarded as the strongest of the “big-box” store house brands. Solid energy glass (especially the premium 3500 and 3900 series) and a transferable lifetime vinyl warranty. The entry series 3201 is average; step up to the 3500 or 3900 series for a better-built window.
Best fit: Lowe's shoppers wanting the most dependable big-box option.
Ply Gem (Home Depot)
Sold through Home Depot under Cornerstone Building Brands. A huge range of series, which is both a plus and the catch, because quality and warranty vary widely. The in-stock 500 Series is the weakest spot, with only a 1-year limited warranty plus 10-year glass; the 1500 and Pro lines are much stronger.
Best fit: Home Depot shoppers, but verify the exact series and its warranty before buying.
Elevate (Grand Prairie, TX)
Built right here in Texas and engineered for our climate. The Inspire Series comes standard with Low-E glass and argon, posting energy numbers that meet the Texas ENERGY STAR target and block over 75% of the sun's heat — the same glass performance found in windows costing far more. The build backs it up: fusion-welded corners that stay weather-tight, multi-chambered vinyl for strength and insulation, triple weatherstripping to choke off drafts, a dual-function sloped sill that channels our hard rain away from the wall, tilt-in sashes for easy cleaning, and metal-alloy locks for security. It carries a strong DP rating (up to 60), is TDI-approved to Texas windstorm standards, and includes a limited lifetime vinyl warranty. Being made in DFW, you also get short lead times, custom sizing built to each opening, and a Texas company that's quick to reach.
Best fit: Builds where you want real energy performance and Texas-made value without paying premium-brand prices.
Simonton (Local Dealers & Home Depot)
Simonton's new-construction Pro-Finish Contractor Series, built by Cornerstone Building Brands (the same parent as Ply Gem). The Pro-Finish Contractor was Consumer Reports' highest-rated vinyl in its class, with AAMA Gold certification, fusion-welded corners, a 10-degree sloped sill, an integral nail fin, and a limited lifetime residential warranty. Its raw U-Factor runs a touch higher than the others, but build quality and brand backing are the strongest here.
Best fit: Budget builds that still want a name-brand window and solid warranty.
Our Honest Take
- On paper, they're nearly identical. All four are vinyl with Low-E + argon glass, so U-Factor and SHGC land in the same narrow band. Don't choose on the sticker number alone — the glass is the easy part.
- These are all entry / builder-grade windows. They're the right tool for budget builds, rentals, and flips, not the premium.
- Warranty terms and backing are the real spread. Ply Gem's in-stock 500 is the weakest on paper; the others carry lifetime vinyl coverage. A lifetime promise from a billion-dollar maker (Atrium, Cornerstone) carries more weight over 20 years than one from a small shop.
- Convenience vs. custom fit. Big-box windows are grab-and-go in standard sizes. Elevate and Simonton are built to your exact opening — often cheaper per unit and a better fit.
- Installation is half the window. Even the best of these underperforms if it's set with gaps and a quick bead of caulk. A properly flashed, sealed install is what makes the rated numbers real, and it's where we don't cut corners.
Our Recommendation
For a budget build, rental, or flip, any of these four will do the job when installed right. If you want the strongest build and brand backing in this tier, we lean toward Simonton. If lowest cost and quick Texas lead time matter most, Elevate is a legitimate pick. Of the two big-box options, RELIABILT is the more dependable; with Ply Gem, make sure you're getting a stronger series than the in-stock 500. Whichever you choose, we specify the glass to Texas targets (U ≤ 0.28, SHGC ≤ 0.23) so your home stays cool and your bills stay low.