You can easily reduce the heat loss or gain from your windows by adding a clear plastic film to the inside. It will help on your energy bill both summer and winter. Yes, use it in air conditioning season and in the heating season.
I highly recommend the 3M Scotch Brand materials for cutting the energy waste at your windows. 3M has long been the champion maker of glues and sticky stuff that works great for the job that it is made for. Their kits for adding clear plastic film to the inside of windows are the best on the market.
Why work on the inside?
You can put clear vinyl plastic film on the out side. Click here to read how to make EASY ADD ON STORM WINDOWS FROM THE OUTSIDE. Most folks would prefer working indoors and if you put the job off too long, the weather is nicer inside. From a safety point of view, I would suggest that you work second story windows from the inside. You avoid working off a tall ladder, leaned against the slippery plastic siding, above those thorny rose bushes.
How easy is it?
It is easy. First sit down and read everything printed on the box. Remember, "if all else fails, read the directions." The directions are an easy read and the illustrations are very helpful.
The first step of the job is to put their special two-sided sticky tape all around the window frame. What is special is that it sticks good, but you can peel it off easily too. If you put it on crooked, like I do, you can fix it with out throwing it away and starting over.
Next, hang an over sized sheet of the clear plastic on the sticky tape.
Then the fun part, use a hair dryer to shrink it so it is tight and wrinkle free.
Last step is to cut away the excess plastic film around the window frame to make a neat looking job.
The wonderful 3M sticky tape is easy to peel off the window frame with out damaging the finish. You can not reuse the tape, but you can reuse the clear plastic film. If you are more organized than I am about putting stuff away where you can find it, use it again.
Do not use the heat shrink film outdoors; it is made for indoor use only.
Here is a source for the materials that you will need:
Click here for Window insulation kits from Amazon.
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