A microscopic metallic coating blocks infrared heat in summer and traps it in winter -- significantly reducing energy bills for Northern Virginia and Maryland homes.
Low-E stands for low-emissivity. The "E" refers to emissivity — the ability of a surface to absorb and radiate heat. Standard glass has an emissivity of about 0.84, meaning it absorbs and re-radiates most of the infrared energy (heat) that strikes it. Low-E glass has an emissivity of 0.02–0.15, achieved by applying an extremely thin metallic oxide coating — measured in nanometers, completely invisible to the eye — to one of the interior glass surfaces.
This coating acts as a thermal mirror. In summer, it reflects the sun's infrared heat back outward before it enters your home. In winter, it reflects interior radiant heat (from your body, appliances, and heating system) back into the room instead of letting it escape through the glass. The result is a glass that works for you in both seasons.
For the DMV climate — classified as IECC Climate Zone 4A (Mixed-Humid) — this two-directional benefit is particularly valuable. Washington DC, Northern Virginia, and Maryland experience both hot, sunny summers (cooling-dominated) and cold winters (heating-dominated). A glass that helps with only one season delivers half the savings. Low-E double-pane glass delivers year-round performance.
Pepco (DC and Maryland), BGE (Maryland), and Dominion Energy (Virginia) all offer efficiency rebates for window upgrades that meet ENERGY STAR requirements. We assist customers with identifying eligible rebates as part of every estimate — the rebates can offset a meaningful portion of installation costs.
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5,000+ DMV customers served since 2004
Measures heat flow through the glass. Lower = better insulation. ENERGY STAR requires U ≤ 0.30 for DMV climate zone.
Solar Heat Gain Coefficient — how much solar energy passes through. Lower = less summer heat gain. For DMV, target SHGC ≤ 0.25.
Visible Transmittance — how much natural light passes through. Modern Low-E glass maintains high VT (0.50+) despite blocking infrared heat.
Real numbers from the DMV climate — not marketing claims. These figures are based on DOE data for IECC Climate Zone 4A.
Less solar heat entering your home reduces AC runtime and peak cooling loads
Low U-factor means less heat escapes through glass on cold DC-area nights
Reduces UV transmission that fades flooring, furniture, and artwork
Typical annual savings for a DMV home upgrading from single to Low-E double-pane
With Pepco averaging 14¢/kWh, BGE 13¢/kWh, and Dominion 12¢/kWh, the math on Low-E upgrades in the DC metro is compelling. Here's a realistic scenario.
1,800 sq ft, 10 double-hung windows, upgrading from single-pane to Low-E IGU
Savings estimates based on DOE residential window retrofit data for Climate Zone 4A, Dominion Energy residential electric rates, and Natural Gas rates for the Northern Virginia area. Individual results vary based on home size, existing windows, insulation, and usage patterns.
If your window frames are in good condition, we replace only the insulated glass unit (IGU) inside the existing frame. This is the most cost-effective Low-E upgrade — no frame removal, no repainting, completed in 1–2 hours per window.
A new Low-E window unit is installed into the existing frame opening without removing the exterior trim or siding. Faster and less disruptive than full-frame replacement, with most of the energy performance benefit.
Complete removal of the old window including frame and installation of new Low-E windows with modern frames. Maximum energy performance and the opportunity to resize openings. Ideal when frames are rotted or damaged.
Pepco, BGE, and Dominion Energy all offer rebate programs for qualifying window upgrades. We help you identify and claim applicable rebates.
DC & parts of Prince George's, Montgomery counties
Pepco's EmPOWER Maryland and DC programs offer rebates for ENERGY STAR certified window replacements. Requirements include minimum U-factor and SHGC thresholds. Available to residential Pepco customers.
Central & Northern Maryland including Baltimore and Anne Arundel counties
BGE Smart Energy Savers Program offers window upgrade rebates for Maryland customers replacing single-pane or non-ENERGY STAR windows with qualifying Low-E products. Income-qualified customers may be eligible for enhanced rebates.
Northern Virginia, Richmond, and most of Virginia
Dominion Energy's Home Energy Savings program provides rebates for ENERGY STAR window replacements in Virginia. Combined with federal 25C tax credits, the overall savings can be substantial. Ask us about current eligibility.
The Inflation Reduction Act's Section 25C tax credit may allow homeowners to claim a percentage of the cost of qualifying exterior window replacements. Qualifying products must meet ENERGY STAR Most Efficient criteria. This credit can be claimed annually, meaning a multi-year window upgrade project may generate the credit multiple times. We provide the manufacturer certification statements required for your tax filing. Ask us for current details.
Double-pane IGUs that pair with Low-E coating
Combine Low-E with tint for maximum solar control
Low-E with laminated for security and UV blocking
Safety glass with Low-E for code-required locations
Acoustic glass with Low-E for energy and noise
Maximum clarity with Low-E energy coating
Related Services
We assess your existing windows, recommend the best Low-E specification for your home, and provide a written estimate that includes applicable utility rebates and federal tax credit guidance.
No obligation -- Rebate guidance included -- Serving DC, Northern Virginia & Maryland