Replacement Windows, Doors & Siding FAQ

We serve Erie and Northwest Pennsylvania, including Erie, Millcreek, Harborcreek, Fairview, Hermitage, Sharon, Warren, Oil City, Franklin, and Meadville. If your town is nearby but not listed, call (814) 746-6338, because we likely serve it too.

We install replacement windows, custom entry doors, sliding and French patio doors, and siding. Our siding comes from Alside, and every product is backed by our lifetime warranty.

Low-E, energy-efficient windows with a low U-Factor are the top choice. Erie’s long, cold, lake-effect winters make insulation the priority, so you want windows that hold heat inside and seal out drafts. We help you choose the right glass package for our climate.

Ask for the NFRC rating on each window. NFRC labels are independently certified and rate whole-window performance by U-Factor and Solar Heat Gain Coefficient. In our cold climate, focus on a low U-Factor first, since that measures how well the window keeps heat in.

ENERGY STAR identifies energy-efficient windows optimized for your climate zone. Erie sits in the Northern climate zone, where the qualifying criteria call for a low U-Factor to hold heat in through the winter. Any window we order with a Low-E glass upgrade is built to meet ENERGY STAR for our zone.

For older Erie homes, yes. Heating costs run high through our long winters. Replacing worn, single-pane windows with energy-efficient Low-E units reduces drafts and heat loss, which eases the load on your furnace and lowers your bills month after month.

Yes. We install durable, low-maintenance Alside siding built to handle lake-effect snow, wind, and freeze-thaw cycles. Insulated siding options also improve your home’s energy efficiency and help hold heat in during the cold months.

Every home is different, so we provide a free, no-obligation estimate. Because we offer factory-direct pricing, Northwest Pennsylvania homeowners get quality windows, doors, and siding without big-box markups. A free in-home estimate gives you an accurate number, usually in about an hour.

Even the best window underperforms if it’s not measured and installed correctly, because the gaps around a poorly fitted window are exactly where cold air and drafts get in. Our professional installation seals those gaps, locks in your energy savings, and is backed by a lifetime warranty.

Most installations are completed quickly, often in a single day depending on the number of openings. We’ll give you a clear timeline during your free in-home estimate and keep you informed at every step, from scheduling to cleanup.

Yes. Along with windows and siding, we install insulated entry doors and patio doors with energy-efficient glass. A well-sealed door works with your windows to keep the winter cold out and boost security and curb appeal.

Yes. The Window Source of Northwest PA is locally owned and operated by the Howell family, a Northwest Pennsylvania father-son team based in Erie and backed by a national brand. Our team lives and works in the same communities we serve. Call (814) 746-6338 for a free estimate.