Window Replacement
Replacement (Retrofit) Windows
Your windows do more than let light in—they help seal your home’s “envelope,” keeping conditioned air inside and the elements out. Even crack-free, older windows can leak up to 30% of your heated or cooled air, driving up utility bills and reducing comfort. At L&L Door and Window, we specialize in Energy Star–rated retrofit windows that slot into your existing frames, delivering superior insulation, sound control, and lasting beauty.
What to Look forin New Windows
We offer both retrofit units (fit into your existing opening) and full-frame replacements (attach directly to wall framing). Key energy-saving features include:
- Durable Frame MaterialsFiberglass, vinyl-clad wood, or aluminum-clad wood reduce heat transfer and require minimal maintenance.
- Multi-Pane GlassDual- or triple-pane units separated by argon, krypton, or other insulating gases block heat transfer and outside noise.
- Low-E CoatingsSpecial microscopically thin metallic layers reflect infrared heat and UV rays, protecting interiors and improving comfort.
- Warm-Edge SpacersHybrid or stainless-steel spacers maintain correct pane separation, reducing edge-of-glass heat loss.
- Energy Star & NFRC RatingsChoose windows with low U-factors (0.20–1.20) and appropriate SHGC values for your climate zone to maximize savings.
Understanding WindowPerformance Numbers
Windows that feature low U-factors, which have a range of 0.20 to 1.20, insulate better, while those with low SHGV (Solar Heat Gain Coefficient) block more heat of the sun. The Energy Department suggests the following values:
| Climate Zone | U-factor | SHGC |
|---|---|---|
| Northern | s0.30 | s0.35-0.40 |
| North Central | s0.32 | s0.40 |
| South Central | s0.35 | s0.35 |
| Southern | s0.50 | s0.27 |
Lower U-factor numbers indicate better insulation against heat loss, while lower SHGC values reduce solar heat gain—crucial for warmer zones like Southern California.
U-FactorMeasures heat loss; lower is better.
SHGC (Solar Heat Gain Coefficient)Percent of solar radiation admitted; lower reduces cooling load.
Visible Transmittance (VT)Amount of visible light transmitted; higher maximizes daylight.
R-ValueInverse of U-factor—higher indicates better insulation.
Recommended for Southern California:- U-Factor ≤ 0.35
- SHGC ≤ 0.30
New windows will pay for themselves as they not only lower your home operating costs but improve its appearance and increase its resale value, according to the National Association of Realtors.
Why Choose Our Retrofit Windows
Precision Measurement & FitLaser-accurate measurements ensure a snug retrofit—no stucco or drywall repair in most cases.
Vendor-Backed Product SelectionCertified Milgard®, WinDor®, and other premium brands—choose styles from single-hung to architectural shapes.
AAMA-Certified InstallationProper flashing, sealants, and weatherstripping techniques preserve manufacturer warranties and performance.
Energy Savings & RebatesEnergy Star models can cut your annual energy bills by up to 50% and qualify for utility rebates and tax credits.
Enhanced Comfort & ValueReduce drafts, noise intrusion, and UV fade—while boosting curb appeal and home resale value.
Window Choice From L&L
1
Popular Styles
Single-hung · Double-hung · Casement · Slider · Fixed · Bay · Bow · Hopper · Geometric shapes.
2
Specialty Options
Skylights · Impact & Storm-rated windows · Sound-control glass · Decorative grilles.
3
Frame Finishes
Painted or stained wood interiors · Vinyl, aluminum, or composite exteriors · Custom colors.
Ready to Upgrade?
Fill out our online form or call 760.345.8089 for your free, onsite estimate. Let our family deliver retrofit windows that pay for themselves—through energy savings, comfort, and lasting style.
Get a free quote760-345-8089
