Pella® Impervia® Fiberglass Sliding Window

Yes, most sliding windows are energy efficient. Energy efficiency is dependent on a number of factors including the material of the window, the type of glass and the number of moving parts.

Sliding windows glide sideways on a track from either the left or the right side. One operable sash overlaps the other stationary sash when opened.

It depends what benefits are most important to you. Pella's fiberglass is the strongest material for windows, offering a low-maintenance and durable finish.⁹ If you're after a window that's tested to extremes, Pella's fiberglass windows are the way to go. Vinyl windows are easy to care for, energy efficient and budget friendly. Pella’s unique vinyl formula is performance-tested for excellent weathering, durability and color retention.

There are many factors that affect the actual long-term performance, appearance and functionality of fiberglass windows, but Pella's fiberglass windows are designed for a lifetime of everyday use.

We’re committed to customer satisfaction. If the product you ordered online is damaged during shipping or you do not receive exactly what you ordered, we want to make it right by refunding you in full or sending you a new product. We do not accept returns of undamaged made-to-order products in which a buyer ordered the incorrect size or color, or decided the product was no longer needed. See pella.com/warranty for additional details and exclusions. If you have questions about returns and refunds, please email shop@pella.com.

For online orders, a local Pella team member will call within 2-14 weeks to schedule pick up or delivery depending on delivery method and production timing. The time to receive your order varies since all products are made to order based on your specifics.

Product only. When you purchase a window, door or replacement part online, your order will arrive with the product only. Installation is not included. If you need installation parts and accessories, those can be purchased online as well.

When you receive your order, you can either install the product on your own with help from our installation kit. Or, hire a Pella Certified Contractor® to take care of installation for you. They are trained and certified to install Pella products.