Both companies sell vinyl replacement windows across the Phoenix area, and both offer a lifetime warranty that transfers when you sell. The difference is who builds the windows. Energy Shield builds its own windows and sliding glass doors in house, made for the Arizona heat. Window World of Phoenix is a locally owned franchise of the national Window World brand.
Side by side
| Energy Shield | Window World (Phoenix) | |
|---|---|---|
| Who they are | Energy Shield Window & Door Company, showroom in Avondale. Builds its own vinyl windows and sliding glass doors. | Window World of Phoenix: "Locally Owned, Nationally Known", a local franchise of the national Window World brand. In business since 1998 per its BBB profile. |
| What they install | Vinyl windows and sliding glass doors (built in house), aluminum multi-slide doors (built in house), entry, French, and security doors, aluminum windows, solar screens, patio enclosures, room additions, casitas | Vinyl window and patio door replacement (BBB profile) |
| Warranty | Lifetime on product and installation for as long as you own the home | "A true lifetime warranty on both product and labor" (its own claim) |
| Transfer on sale | To the second owner | "Transferable" (its own claim). A national review lists a $250 transfer fee; ask your local store. |
| Lowest advertised SHGC | 0.14 NFRC-certified whole-window (single hung and horizontal slider, LoE³-340+ glass, both series; 0.14 to 0.16 across every window with that glass: every product) | 0.14 for its SolarZone Sunshield glass (its own figure; the source does not say whether it is whole-window or glass-only) |
| Price per window, installed | $635 to $890, published (pricing) | Not published. Estimated $300 to $1,300, often sold in packages of several windows (HomeGuide) |
| License | Arizona ROC #357557 (residential) | Look up the store's ROC license before you sign |
| BBB | Accredited, A+ | Accredited since September 30, 2009, A+ |
Where Window World is stronger
- A national brand with stores in many states, if that matters to you.
- A long BBB record. Accredited since 2009.
Where Energy Shield is stronger
- We build what we install. Our vinyl windows, vinyl sliding glass doors, and aluminum multi-slide doors are built in house, made for the Arizona heat. What we make and what we resell.
- More than windows. Entry, French, sliding, multi-slide, and security doors, plus patio enclosures, room additions, and casitas, from one company.
- Numbers up front. Our price ranges and the SHGC of every current window series are published.
How to compare the two quotes you get
- Ask for the whole-window SHGC and U-factor of the exact window quoted, with its NFRC label. A glass-only number is not the same thing.
- Ask for the written warranty, and check the transfer terms and any fee.
- Compare the price per window, and what each quote includes.
Get our number with a virtual quote or a free estimate.
Questions
What is the difference between Energy Shield and Window World? Energy Shield builds its own vinyl windows and sliding glass doors in house, made for the Arizona heat. Window World of Phoenix is a local franchise of the national Window World brand. Both advertise a lifetime warranty that transfers when you sell.
Do Energy Shield and Window World both offer lifetime warranties? Yes. Energy Shield covers product and installation for as long as you own the home, transferable to the second owner. Window World of Phoenix advertises a lifetime warranty on product and labor that is transferable.
Sources
- BBB, Window World (Phoenix) profile, https://www.bbb.org/us/az/phoenix/profile/windows/window-world-1126-36007628 (checked 2026-10-21): accredited since September 30, 2009; A+; in business since 1998; vinyl window and patio door replacement.
- Window World of Phoenix listing, https://maricopacountyhomeshows.com/home-improvement-referrals/window-world-of-phoenix/ (checked 2026-10-21): "Locally Owned, Nationally Known"; "a true lifetime warranty on both product and labor"; "covers accidental glass breakage"; "this lifetime warranty is transferable"; "SolarZone Sunshield Glass, with 0.14 Solar Heat Gain Coefficient (SHGC) rating".
- HomeGuide, "How much do Window World windows cost?", https://homeguide.com/costs/window-world-cost (checked 2026-10-29): $300 to $1,300 per window installed; stores sell packages of 6, 8, or 12 windows with installation. Window World does not publish prices; quotes vary by store.
- CNN Underscored, Window World review, https://amp.cnn.com/cnn/cnn-underscored/home/window-world-review (checked 2026-10-21): a $250 warranty transfer fee is listed as a con.
Written by Ennis Rushton, co-owner, Energy Shield Window & Door Company. Updated October 29, 2026. Competitor facts checked 2026-10-21.
