Storm windows with a low-e coating reflect heat back inside the house during the winter and reflect it outside during the summer, keeping the home more comfortable.
Older storm windows were typically just clear glass, but newer low-e models have a low-e coating that lowers the emissivity of the glass and reduces heat transmission through the storm window. Uncoated glass typically has an emissivity of around 0.84, while low-e coated glass can have an emissivity of 0.16 or lower. Learn more about energy performance ratings.
New low-e storm window designs can be operable or fixed in place and reduce air leakage more than some older storm window designs.
In heating‐dominated climates in north/central zones, low‐e insulating storm panels (both interior and exterior) and insulating cellular shades are effective at reducing heat loss and heating and cooling costs.
In warmer climates, solar control low-e storm windows will likely be more effective for energy savings.
Benefits of Low-e Storm Windows:
- Costs about one-quarter of complete window replacement[CA1]
- Aesthetically pleasing
- Reduces drafts and increases comfort
- Reduces noise
- Similar energy savings as full window replacement
- Reflect radiant heat 35% better than clear glass storm windows
- Act as an air sealing measure and can reduce overall home air leakage by 10%
- Payback of 5-7 years
Low-e exterior or interior storm windows can save you 12%–33% on heating and cooling costs, depending on the type of window already installed in the home.