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@ YaminiM LEED AP, Not exactly sure I can give you a %. To give an example, our home is 2800 sqft with two SEER 13 HVAC units. Our last energy bill was $109.19. I can feel less heat coming through the windows than before prior to having the window film applied. I have notice the HVAC unit for upstairs does not turn on as often as it did prior to the film being installed. Both units are
Our film is rated: Rejects up to 71% of the heat coming through your windows.
We are energy conscious people, so the window film may not be the sole reason for the power usage. We have installed CFL in every fixture. Total about 55 bulbs have been changed. I installed a Hot water heater timer also and use energy efficient appliances. Again, not sure as to how much the window film has contributed, but I'm sure it is not hurting the effort. Also, the design of your home and the direction it faces makes a difference also. South facing homes is going to get more sun then North facing homes will get therefore, the window film would not be as effective on a North facing home and your savings probably wouldn't be as noticeable.
@ Maria, We did not install the film ourselves. Price depends on which 3M film you choose.
@Tom, Home depot sells window film that is DIY which I was going to do myself. I use to tint car windows when I was younger to make money, so I felt I could do it, but the 3M product compared to the film that Home Depot sells that is DIY is nowhere near close to performance of the 3M film. Plus, The 3M has a life time warranty. If it ever peels or bubbles, they come back and replace it for free. It really is a case of you get what you pay for.
@ Lissa, I would replace the older windows first with more energy efficient windows before having the film installed. You can't buy the 3M Window Film itself unless you are an Authorized Dealer. So as a consumer, you have to go through an Authorized dealer to purchase 3M window film which will say only Authorized installers can apply the film if you want the life time warranty. 3M won't honor replacement if a dealer does not install the product. The installer did a great job on our windows and covered the windows with one seamless film. Corner to corner, no bubbles, no ugly seams.
@ Matthew, the windows were done by one installer who came in, removed all the cladding on the window and measured all the windows first. All the windows were completed in 2-3 hours including the window above the front door that is 4'x4'. The front door is 8 feet tall and the bottom of the window is another 3 feet above the front door. This window and all the windows were install with one solid film. No seams or lines. The installer reinstalled the curtains and rods. Very professional and pleasant.
I have noticed the window film absorbs the heat from the sun, but does not transfer it into the home. I have a laser thermometer and the film will register 120F+ on a 90F+ summer day, but the light on the floor through the window registers about 25-30 degrees cooler than if the window was up letting direct light into the room. I did an experiment with the window up letting light through for 30 mins then closed the window and the difference was significant 30 mins later. The film also blocks 99% of UV rays which will fade carpet, hardwood, curtains and furniture.
@Jean, I can see the double pane windows being an issue due to the design of the window itself. Our windows are not double pane. I have noticed, believe it or not, the transferred heat energy into the home is much less, but that solar energy doesn't dissappear obviously. (Energy is neither created, not destroyed). The film itself appears to hold (absorb) the heat instead of letting it come
@YaminiM LEED AP, The film on our windows are still in place and has saved us so far about a whooping $10-15/month compared to the electrical bill from the previous year for the same month's electrical bill. I have been keeping up with the difference and so far it appears to be performing exactly as indicated. The rooms especially upstairs are noticably cooler (heat rises) and the A/C unit upstairs does not have to run constantly as it once did. We keep the temp upstairs @ 75F and the unit downstairs at 74F. The unit upstairs still runs more than the unit down stairs, but that could be just the design of the house and the way the air circulates with the open floor design. The units both are 3 yrs old and are kept on a maintance schedule so they run pretty effieciently. There are many times during the day in the middle of summer that neither unit is running (rare), but it happens and I think the window film has a lot to do with it along with proper insulation in the home of course.
@Maria Rosario, no I didn't install it myself. This is a 3M product and only an authorized dealer can install it for the warranty to be active.