A cheaper alternative to Indow window inserts - DIY install - stay warm in winter and cool in summer 

Update: Larson discontinued all of their storm window products in December 2022.
I've now installed these windows, check out my review: • Customer Review of Lar...
I think Indow Window Inserts are an awesome looking product, but I wanted to see what else was out there and if there was anything cheaper. I found a great quality product by a company called Larson who make storm windows. In this video I show a demo model of Larson Comfortseal interior window inserts. They're easy to install, and help keep your house warmer in the winter, cooler in the summer, and quieter all year round!
They are easy to install DIY, here is my detailed installation video: • Installing Larson Comf...
I like that this is a quality product that's not too expensive. For a similar size, the Larson comfort seal are less than half the price of Indow. They also do them in different styles, so you can have it fixed (a single pane of glass), as well as single or double hung, or slider. You can choose from 3 colors of frame as well as clear or low E glass, which helps keep out the heat from the sun. That's not an option available with Indow as they're using acrylic instead of glass. They're not sold online though, so check out the Larson website for a local dealer. While they're not sold online you can check the Menards website to get an idea of pricing.
Indow is a registered trademark of R Value LLC. Larson is a registered trademark of Larson Manufacturing Company of South Dakota, Inc. I'm not affiliated with either company, just a proud homeowner, lover of This Old House, and someone that's passionate about DIY and home improvement!