Windows and Doors

Windows and doors can play a major role in the comfort and beauty of your Maine or New Hampshire home. Windows provide light, fresh air, and a view of the world around your home. Doors open to provide indoor and outdoor access, as well as safety and security. But when windows and doors don’t function well, they can waste your home’s energy and make your home feel drafty and uncomfortable.

Time to Replace Windows and Doors?

Contractor installing window in new home

It can be difficult to know when it’s the right time to invest in new, energy efficient windows and doors. One great way to get a handle on your window and door performance is for STP Home Performance to conduct a home energy audit. We’ll utilize our extensive experience and thermal imaging to assess all aspects of your home’s energy efficiency, from insulation and air sealing, to ventilation and safety. Our energy audit expert will also take a look at the performance of your home’s windows and doors.


It may be time to upgrade your windows and doors if these problems are identified:


  • Poor air sealing around windows and doors

  • Single-pane glazing

  • Cracked, fogged, or clouded glass

  • Rotting or damaged window or door frames

  • Windows that won’t open or close

  • Doors that stick

  • Rooms that feel drafty, too hot, or too cold

Home Window Retrofits for Efficiency & Curb Appeal

Beautiful, energy efficient windows can transform a home into a comfortable, light-filled space. The window pros at STP Home Performance can help you select the right new windows and doors to reimagine your home’s indoor and outdoor appearance.

Authorized Marvin Window Installer

Integrity from Marvin Windows & Doors logo

We prefer the fine craftsmanship and energy efficiency of Marvin Integrity windows, which offer hundreds of choices for sizes and styles with triple-paned construction. Marvin windows use their insulating glass and frame design to provide Energy Star® rated windows to save energy dollars. Their easy-to-clean designs feature unique sizes and styles to give your home in the greater Wells, York, or Portsmouth area a fresh and appealing look without compromising performance.

Windows & Doors Designed for Passive Houses

Because Passive Houses require both energy efficiency and the need to harvest the sun’s radiant heat, we prefer Wasco windows and doors to meet these specialized requirements. Wasco window and door designs begin with high-efficiency triple pane glazing to allow the sun’s rays to pass through, yet keep cold air at bay. Passive House design uses an abundance of windows, so it’s essential to have the ability to tilt, pivot and rotate to maximize air flow to maintain inside comfort.


In their Wisconsin plant, Wasco uses German components to assemble their super efficient triple-pane windows. Wasco windows offer flexible positioning to allow air flow and regulate interior home temperatures in the summer. The company also makes a unique European design doors, including french doors, tilt-and-slide patio doors, storm doors, and conventional entry doors — all uniquely suited for Passive House construction.

Windows & doors can be beautiful and energy efficient. Our energy efficiency experts can help your select the right windows and doors. Call (207) 831-0679 or contact us today to schedule a consultation!

Need to upgrade windows for your new home?

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(207) 831-0679

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