Storm windows for old New Orleans homes

Storm windows can meaningfully cut drafts and energy loss in an older New Orleans home without replacing original wood windows, but how much they help depends on the type you choose, how well they’re sealed, and how your home manages humidity. For most historic properties, adding well-fitted storm windows over existing sashes is a lower-cost, less invasive step than full window replacement, and it preserves the original woodwork many buyers and preservation reviewers want to see.

What storm windows actually change

A storm window adds a second layer of glazing and an air gap between the outdoors and your original window. That extra layer reduces drafts and can lower the rate of heat transfer through the window assembly. The Department of Energy’s guidance on air sealing points to gaps around windows and doors as common sources of uncontrolled air movement, which is the main thing a properly installed storm window addresses—it doesn’t add meaningful insulation value on its own, but it stops the air leaks that make an old single-pane window feel drafty.

Interior versus exterior storm windows

Exterior storm windows mount outside the existing sash and are the traditional approach on shotgun houses and Creole cottages. Interior storm panels mount on the inside and are often preferred when a home’s exterior appearance is protected by historic district rules, since they’re invisible from the street. Either option can work; the choice usually comes down to appearance requirements, the condition of your existing exterior trim, and whether you want removable panels for cleaning and ventilation.

Inspect the existing windows first

Look for gaps or peeling glazing putty, check whether sashes move smoothly, and note soft or rotting wood at the sill. Pre-1978 paint may contain lead, so test it before sanding or disturbing the finish.

Humidity and condensation in a coastal climate

New Orleans’ combination of high outdoor humidity and long air-conditioning seasons means moisture management matters more here than in drier climates. Storm windows that seal too tightly against a wall assembly not designed for that level of airtightness can sometimes trap moisture rather than release it, so any storm window installation should allow the original window and surrounding trim to still drain and dry. The Department of Energy’s overview of insulation notes that improving a home’s envelope works best as a coordinated approach rather than isolated upgrades, which is worth keeping in mind if you’re also considering attic or wall insulation changes alongside storm windows. If you notice condensation between the storm panel and the original sash after installation, that’s a sign the installation needs adjustment, not something to seal over yourself.

Storm windows compared to other window treatments

If storm windows aren’t feasible for a particular window—because of historic restrictions, budget, or a window that needs repair first—interior treatments like cellular shades or heavy drapes can reduce heat gain and loss in the meantime. The Department of Energy’s guidance on energy-efficient window coverings covers how different coverings perform, which can help you prioritize which rooms or windows to address first.

Sources

Department of Energy, accessed 8/12/2026
Department of Energy, accessed 8/12/2026
Department of Energy, accessed 8/12/2026