Be comfortable with your energy bill.
Slocomb windows and doors are engineered to meet and exceed the strictest ENERGY STAR® requirements — savings that can reach hundreds or even thousands of dollars per year.
Warm edge + Low-E + argon.
It’s this combination that keeps heat where you want it — regardless of season.
Cooler in summer
Total solar energy through High Performance Low-E is almost 63% less than standard clear insulating glass.
Warmer in winter
Winter nighttime insulating value is as much as 88% better than standard clear glass.
Less fading
Reduces fabric-fading UV energy 90% more effectively than clear insulating glass.
Plenty of daylight
Transmits about 80% as much visible light as standard clear insulating glass.
Solarban® 70XL by PPG.
Three layers of silver — compared with the typical two — reflect radiant heat back inside in winter and keep solar heat out in summer.
- Blocks up to 84% of harmful ultraviolet rays
- Argon gas is denser than air, slowing heat transfer
- Every Slocomb window with Low-E is ENERGY STAR® compliant in every U.S. region
How a Low-E coating is layered
Triple-pane performance. Dual-pane durability.
Traditional Low-E has one coating on one surface. UltraFlect combines two different high-tech reflective coatings — one on each piece of glass — the most dramatic advance in window glass technology in more than a decade.
UltraFlect Dual Glaze
Three layers of silver oxide (11 total layers) protected inside the air space reflect the sun’s rays outside, while a ceramic tin-oxide layer bonded into the glass reflects furnace heat back inside.
Range across 200, 400 and 100 Series
UltraFlect 3 Triple Glaze
Coatings across three pieces of glass protect against excessive solar heat gain and UV while maximizing daylight. R-6 with argon or R-7 with krypton fill — ENERGY STAR® Most Efficient performance.
400/500 Series triple glaze, no grid
Optional UltraFlect exceeds all ENERGY STAR qualifications, including the standards that took effect October 2024.
Standard on every Slocomb window.
An all-in-one, non-metal warm-edge system — five components in a single product — tested through thousands of freeze-thaw cycles and a year of heat, humidity and UV.
- Lowest-conductivity warm-edge spacer
- Improved condensation resistance
- Superior argon gas retention
- Impermeable foil moisture-vapor barrier
- Unique patented design
- Exceeds ENERGY STAR® requirements
Questions on energy efficiency
What makes a window or door energy efficient?
Many factors: how the frame and sashes are engineered and built, the type of glass (single, double or triple pane), the weatherstripping, the Low-E coating and the presence of argon or krypton gas.
What’s the difference between U-value and R-value?
U-value (U-factor) measures how much heat a window transmits — the lower, the better it insulates. R-value measures resistance to heat flow — the higher, the better. U-factor is the number that matters most for windows today.
What is Low-E, and do I need it?
Low emissivity is a microscopic metallic coating on the glass that reflects heat energy into or out of the home depending on the season. Every Slocomb window and door with Low-E is ENERGY STAR® compliant in every U.S. region.
What is ENERGY STAR®?
A U.S. government program administered by the DOE and EPA. Windows can only carry the label if they’re tested by an independent laboratory through NFRC and meet specific U-value ratings.
What is the NFRC?
The National Fenestration Rating Council administers the only uniform, independent rating and labeling system for windows and doors. Participation is voluntary and requires third-party inspection — Slocomb participates.
Does argon or krypton gas really help?
Yes. Both are heavier than air, so they resist convection and insulate better. They occur naturally in the air you breathe and are completely harmless.
How important is weatherstripping?
Very. It is the only element that makes operating windows reasonably airtight. Slocomb windows use multiple layers designed for the tightest possible seal.
Can windows block fading UV rays?
Low-E glass filters more than half of damaging UV light; Slocomb High Performance Low-E reduces fabric-fading UV energy 90% more effectively than standard clear insulating glass.
Ready to see Slocomb windows in your home?
Our network of independent dealers measures, sells and installs Slocomb windows and doors across 22 states. Find one near you.