Do Window Inserts Work?

How Inserts Work

• Window inserts help your home retain energy by providing an extra layer of insulation against the elements. These sheets of plastic install over your window panes and work to seal gaps in your framing that could cause air to leak from your home or rush in from the outside. The plastic used for the window inserts isn't porous. This means, once you install the window inserts properly, air cannot pass through them in either direction. Air can still leak through exposed cracks or gaps in your window frames where the plastic doesn't touch.

Proper Installation Required

• Installing window inserts doesn't require expert help, but you do have to be methodical and patient throughout the process. Slapping the plastic inserts on your windows without taking your time creates air bubbles between the window panes and the plastic. This allows air to move through the inserts and defeats any energy saving benefits. According to Apartment Therapy's website, you apply the inserts using double-sided tape and shrink the inserts to fit window frames by applying heat from a hairdryer. Smooth out any remaining air bubbles with your hand to complete the installation.

Low Savings/Bad Look

• Installing window inserts isn't a substitute for repairing old windows or window frames with existing damage. The energy plastic inserts can help your home retain is small compared to the savings from installing energy efficient windows and new window frames. Purchasing Energy Star certified windows and frames can also qualify you for tax credits from the federal government for up to 30 percent of purchase costs, as of the date of publication. Plastic inserts can also give your windows a cloudy look that might inhibit a clear view through the glass, if you mess up the installation.

Installing Low-E Film

• Low-E film is more expensive than a standard plastic window insert. This type of insert has a special coating to provide greater insulation for your home windows by reflecting heat back into your house. According to The Daily Green's website, low-E film can help improve energy efficiency and reduce heat loss through your old windows by as much as 40 percent. You might need to hire an expert to install low-E film properly because the material is more expensive and you don't want to risk damaging your purchase.