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Experience Window World's unrivaled ENERGY STAR replacement windows, doors, vinyl siding, shutters and more. Contact us to schedule your free in-home or virtual quote today!
Salesman was very helpful . Window installers were very good and nice to talk to.
DN
Daniel Nienhuis
Sep 29, 2025
5.0
Everything went smoothly — from the initial consultation to installation — and the quote was very reasonable. We had three windows and a door done and everything looks great! A few of our friends have had Window World do work for them and they have also been satisfied. Highly recommended!
GF
Gina Fox
Aug 27, 2025
5.0
Everything went perfect! Fantastic installers! Widows and doors slide with ease also could feel the insulation difference the install day, a/c unit running less. Definitely recommend. Reasonable prices too!
AD
Anna CG. DG.
Aug 6, 2025
5.0
We had 20 windows installed in our house. We could see the worst one would be our kitchen window but they had it in no problem. Took them one afternoon to install the windows and finish off the outside trim, and another morning to finish off caulking. They did a beautiful job.
LM
Leslie Murphy
Jul 14, 2025
5.0
Window world did an excellent job of presenting their products in a no - pressure kind of way. They then installed our windows in an efficient and careful manner. The technicians were friendly and professional. They worked hard and finished in a timely manner, leaving no trace behind! We love how our house looks and the function and efficiency of our new windows. Thanks WW!
Frequently Asked Questions About Window World of Mifflinburg
What types of payment methods and financing do you offer?
We offer a variety of payment methods and financing options (subject to approved credit) depending on promotional period. Please contact us for more information regarding available options.
Will the replacement windows be installed from the inside or outside?
The majority of our replacement windows are installed from the outside. In some situations it may be necessary to install from the inside. On the day of installation, your installation expert will assess your unique situation and explain the process that will best suit your home.
Do you install replacement windows year-round? If so, will I lose a lot of heat/cooling at the time of installation?
Window World installs replacement windows year-round. An average installation will take only one day. Our crews install one window at a time and are trained to do what they can to minimize heating/cooling loss. The energy savings from your new windows will recover any incremental energy costs incurred during their installation many times over during their lifetime.
How can I prepare my house for my replacement windows?
Please take down curtains, blinds, or any other window treatments. Security sensors should also be removed and turned off by your security company. Please provide our installation expert with a clear path to the window(s) being replaced by moving anything that may be in the way. It is also advisable to remove all wall decorations from the walls close to the windows as they may fall during removal or installation.
How long will it take to get my replacement windows? How much time should I allow for the installation?
Since every window ordered is custom-built to fit your home and design choices, manufacturing times vary. Once delivered, the type of window being installed and the type being removed help determine the amount of time needed to complete the job. On average, each window takes about 30 minutes. Trim work and cleanup will require additional time to complete. An average job will take a single day.
What type of warranty is available for my windows?
All windows and patio doors we sell come with a manufacturer’s lifetime limited warranty and a repair labor guarantee, good for as long as you own your home! Contact us or see our warranties page for more details.
What happens to my old windows?
After installing your new replacement windows we remove all old windows from your property and dispose of them properly. If you wish to keep your old windows or storm windows, please notify the installation crew as soon as it arrives for your installation.
What do I do if there is a problem with the windows?
Most of the issues encountered by our customers are easily corrected and don't necessarily mean that there is a problem with your window. You are always welcome to contact us for help.
What types of payment methods and financing options does Window World of Mifflinburg offer?
We accept cash, check, and offer financing options subject to approved credit depending on promotional periods. Please contact us for the latest details.
Will my replacement windows be installed from the inside or outside?
Most replacement windows are installed from the outside. However, your installation expert will assess your home's needs on installation day and explain the best process.
Do you install replacement windows year-round, and will I lose heat or cooling during the process?
Yes, we install year-round. Installation usually takes one day and we minimize heating/cooling loss by installing windows one at a time. Energy savings will offset any temporary loss.
How can I prepare my home before the window installation?
Remove curtains, blinds, and window treatments. Disable and remove security sensors with your security company’s help. Clear paths to windows and remove nearby wall decorations to avoid damage.
How long will it take to get and install my custom replacement windows?
Manufacturing times vary as each window is custom-built. Installation usually takes one day, with about 30 minutes per window plus trim and cleanup time.
What kind of warranty comes with my new windows?
All windows and patio doors come with a manufacturer’s lifetime limited warranty and a repair labor guarantee for as long as you own your home.
What happens to my old windows after installation?
We remove and properly dispose of your old windows. If you want to keep them, please inform the installation crew upon arrival.
What should I do if I encounter problems with my new windows?
Many issues can be easily corrected. You are encouraged to contact us for assistance anytime you experience problems.
Are there any nearby grocery stores or pharmacies if I want to shop before or after visiting Window World of Mifflinburg?
Yes, Weis Markets is close by offering grocery and pharmacy services convenient for combining errands with your visit.
Can I find fuel or convenience items nearby Window World of Mifflinburg?
Yes, Sheetz, a convenience store and gas station, is nearby for fueling your vehicle or picking up essentials when visiting us.
Are there any local services for kids near Window World of Mifflinburg?
SUMMIT Early Learning preschool is nearby, which might be helpful for families coordinating visits or pickups with our location.