Double glazing film panels are adhesive specialty plastic films—often made of polyethylene terephthalate (PET)—that can be applied directly onto your windows or frames (depending on the type). These films help filter light and heat, mimicking the insulation provided by traditional double-glazed windows at a fraction of the cost.

How It Works:

• The film panels are applied directly to your windows or to your window frames, depending on the type. This acts as an extra insulating layer. 
• DIY double glazing can reduce heat transfer in summer and prevent indoor heat from leaking during winter, making your home more energy-efficient year-round. 
• Ideally used for: fixed-pane or casement windows
• Not well suited to: windows with irregular, complex shapes and mullions.

Advantages:

• Energy Savings: Helps maintain consistent indoor temperatures, reducing both cooling and heating costs throughout the year. 
• Affordability: A cheap and immediate alternative to waiting for your landlord to upgrade your windows to double-glazing. 
• UV Reflection: Filters out UV rays, reducing sun damage to your skin and furniture. 
• Glare Reduction: Improves visibility on TV screens and computer monitors.
• Aesthetic Flexibility: Comes in a range of designs and tints to complement your home's decor.
  
  

Limitations:

• Sealing: Must be applied to well-sealed windows for maximum efficacy.
• Installation Skill: Requires patience and a steady hand to avoid air bubbles and wrinkles.
• Rental Tenure: Best suited for longer-term rentals due to the tedious installation and removal process.
• Limited Reusability: Difficult to reuse on different windows if you move homes. 
• Ventilation: While excellent for insulation, these films can reduce natural airflow if your windows are kept closed.
  
  

Instructions/Method:

• Prep: Measure the dimensions of your windows.
• Purchase Materials: Buy double glazing film that will sufficiently cover your windows.
  • Check whether your chosen film is applied directly to the windows (like a decal) or to the window frames. 
• Cut Film: Trim the film to fit your window dimensions.
• Apply: follow the instructions provided, the films are likely to be self-adhesive but may require purchasing double-sided tape. You may need a scraper to remove air bubbles. 

Tips:

• For Added Insulation: Consider applying thermal film before the double glazing film.
• Periodic Maintenance: Check the edges periodically to ensure they remain well-sealed.

Caution:

• Flammability: Some films may be flammable. Keep this in mind if you’re installing them in kitchens or near open flame (i.e. a BBQ). 
• Environmental Impact: some films are easy to remove and reuse, others are not. Try and find a film that is reusable to reduce environmental waste. 

Buying guide:

• Energy Efficiency Ratings: Look for a high energy-efficiency rating. This will ensure that the film will reduce heat transfer and save energy effectively. 
• UV Protection: Opt for films with high UV protection. 
• Reusability: Where possible, choose films which are designed to be easily removable and reusable. This will ensure you can take your film with you at the end of your lease. 
• Customer Reviews: Checking reviews will give you the best indication of how effective the film is, how long it lasts and how easy it is to install and reuse.