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With Marvin, you don’t have to sacrifice beauty to get the best in energy efficiency. We are committed to providing window and door options that will help control your long-term energy costs. And as the market leader in energy-efficient windows and doors, Marvin offers more than 150,000 energy-efficient options, along with the superior quality and made-to-order flexibility that all our products are known for. Our guiding principle: Windows and doors should be beautiful, functional, durable and energy efficient.

Green Your Home With Windows

Windows are one of the key elements to consider when looking to increase a home’s energy efficiency. Many factors come into play when choosing the right window from climate to desired conservation efforts. Marvin windows and doors is the leader in energy-efficient solutions. Know what to look for when choosing your next window.

Energy Efficiency Basics

Today, there are established standards that make it much easier to see how various windows and doors stack up against each other. When shopping for your windows and doors take the following factors into consideration.


ENERGY STAR® is a program of the U.S. Environmental Protection Agency designed to recognize products that meet strict energy efficiency guidelines.


U-Factor correlates to the rate of heat transfer. The lower the number, the better a window is at keeping heat inside a building. The U-Factor is key in regions with cold winters. Just remember: the lower the U-Factor, the lower the rate of heat loss through a window.


Solar Heat Gain Coefficient measures how well a product blocks heat from the sun. In warm climates, the lower the number, the better. Here you want to keep heat out by choosing windows that reflect solar radiation. Less heat coming into the home means lower air-conditioning costs and a reduced carbon footprint. In cold regions, your windows can also help you take advantage of solar radiation, which is free heat that eases the workload of your furnace or other energy-powered heat source. A higher solar heat gain coefficient means a window will allow more heat to pass through.


Design pressure (DP) Rating measures the amount of pressure a door or window will withstand when closed and locked. Each DP rating also establishes other performance factors such as water penetration, air infiltration, structural pressure, forced entry and operational force. The higher the DP numbers, the better the performance. Look for the certified hallmark of the Window and Door Manufacturers Association.

Energy Efficient Solutions

Marvin allows you to craft a customized energy solution for your project’s unique needs. You can choose from thousands of options to help you achieve optimal energy efficiency.


Marvin offers thousands of window and door options with two or three panes of glass and/or suspended films.


Extremely thin coatings of special metallic material applied to glass panes used in windows and doors to boosts their energy efficiency. The industry standard for energy-efficient glass coatings has become Low-Emissivity (LoE) glazing. Coating a glass surface between each pane with LoE material can block a significant amount of heat transfer, reducing your home’s need for energy-consuming climate control systems.

LoE coatings are transparent to visible light, and different types of coatings have been designed to allow for high solar gain, moderate solar gain or low solar gain.


Single Layer Metallic LoE Coatings, such as LoĒ-180®, allow the sun’s warming rays to pass through, and are ideal in applications where solar heat gain is desired, such as northern climates. LoĒ-180 Features a single metallic coating and an insulator that blocks heat loss to the outside while reflecting heat back into a room. Provides a low U-factor and a high solar heat gain.

A Double Layer Metallic Coating, such as LoĒ2-272®, is suitable for all climates, except the southern ENERGY STAR zone. It features a double metallic coating on the inside glass surface to reflect heat into the room in winter and reject the sun’s warmth in summer, reducing damaging UV rays. This coating option provides better protection against radiant heat transfer than single layer metallic Low-E coatings.

Triple Layer Metallic Coatings such as LoĒ3-366® are often specified in the southern ENERGY STAR zone where cooling costs are high and intense exposure to the sun is an issue. It features three metallic layers of silver. This coating offers the lowest U factor and lowest solar heat gain.


Insulating gases fill the spaces between the glazing layers. These inert gases are pumped into the spaces between panes of glass to slow the transfer of heat, increasing the insulating power of a window or door.

  • Argon – Our standard windows and doors come with argon gas between the panes to boost energy efficiency.
  • Krypton – Customers seeking to maximize energy savings can consider our blend of krypton, argon and air. This option increases the insulating capabilities by lowering the U-Factor with narrow airspaces.


Marvin offers these enhancements to further increase the energy efficiency of our windows:

  • ENERGY PANEL – Often confused with storm windows, an energy panel is a glazing option consisting of a removable exterior glass panel finished on the edges with a surround. Energy panels cover the exposed glass surface of each sash, and offer added energy efficiency for wood windows with single glazing.
  • STORM AND SCREEN COMBOS – A combination unit is composed of two movable glass panels and one movable screen panel. The individual panels can be configured multiple ways, and can be easily removed from the interior for cleaning. Customized commercial screens are also available.
  • LOW AIR INFILTRATION – All Marvin window and door products meet the WDMA requirements for maximum air infiltration.
  • XL EDGE™ SPACER – Marvin offers the warm-edge XL Edge™ spacer from Cardinal IG — the most durable spacer system on the market. The spacer helps prevent energy loss around the perimeter of the window glass.
  • FULLY INTEGRATED SHADES – When used correctly, shades can help lower energy use and provide significant thermal benefits.