Low-E Film for Windows: A Comprehensive Guide to Saving Energy and Protecting Your Home
What is Low-E Film?
Low-E film, also known as sun control window film, is a thin plastic layer applied to the inside of windows to enhance comfort, privacy, safety, and security. It is composed of a coated plastic film that contains metal or metal oxide to counteract harmful UV rays.
Benefits of Low-E Film
- Blocks UV rays: Low-E film effectively blocks up to 99% of UV rays, shielding your home and belongings from damage and fading.
- Reduces solar heat gain: By reflecting solar heat, low-E film helps keep your home cooler in the summer, reducing the strain on your air conditioning system and potentially saving you money on energy bills.
- Protects home and belongings: Low-E film not only shields your home from UV rays but also protects your furniture, upholstery, flooring, and artwork from fading and damage.
- Improves comfort, privacy, safety, and security: Low-E film can reduce glare and increase privacy without compromising your view. It can also deter burglars by making it difficult to see inside your home.
Installation and Cost
Installing low-E film is relatively easy for small windows. However, for larger windows or to ensure a professional finish, it is recommended to hire a professional. The cost of DIY installation ranges from $25 to $30 for every 75 square feet of window glass.
Choosing the Right Low-E Film for Your Climate
The type of low-E film you need depends on your climate and the orientation of your windows. If you live in a cold climate, opt for a low-E film with a high solar heat gain coefficient (SHGC) rating. Conversely, if you live in a warm climate, choose a low-E film with a lower SHGC rating.
Pros and Cons of Low-E Film
Pros:
- Blocks UV rays
- Reduces solar heat gain
- Protects surfaces of home interior
- Easy to apply
- Non-permanent attachment
- Saves money by reducing A/C usage
Cons:
- Casts tint in house
- Perfect installation difficult
- Houseplants receive less light
- May void window warranty
- Some may be difficult to remove
- Only help with sun, not drafts
Low-E Film vs. Window Insulation Film
If your home is cold or the windows experience drafts, low-E film is not the right solution. Instead, consider installing window insulation film, which is applied to the window trim with double-sided adhesive tape. This creates an insulating space between the film and the glass, preventing heat loss and drafts.
Additional Tips
- Consider the visible transmittance rating (VT) of the low-E film to ensure you maintain adequate natural light levels.
- If you are concerned about the appearance of low-E film, choose a film with a low tint or a film that is virtually clear.
- Regularly clean your low-E film with a mild soap solution to maintain its effectiveness and appearance.