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Get The Facts
  • Vinyl, fiberglass and aluminum-clad windows have maintenance-free exteriors.
  • Low-e coatings can help insulated windows retain heat in winter and limit heat gain during the summer.
  • Like windows, exterior doors can also carry an Energy Star rating.

Replacement Window and
Door Installation

New Windows and doors can help you save energy.


This video talks about replacing an old aluminum frame window with a high efficient window. Larry Janesky from Dr. Energy Saver explains what a window energy efficiency label means.
The windows and doors in a house have an impact on energy performance, just like insulation, HVAC equipment, lighting and water heating. But windows and doors have extra importance in any home, because they get used every day and they are visible features that contribute to a home's personality and curb appeal.

Dr. Energy Saver works with many of the most popular window and door manufacturers, and installs top-of-the-line, energy-efficient windows and doors across the country. Our energy technicians will help you identify the best products for your home.

Replacement Window Cutaway
New exterior doors that replace older,
especially leaky ones, can have a surprising
impact on energy use.

Replacement Exterior Door Installation

When an existing house gets a new entry or exterior door, the most common practice is to remove the old door in its entirety: trim, door frame, threshold and the door itself. This leaves a rough opening that's ready for a new pre-hung door. "Pre-hung" means that the door comes already hinged to a complete door frame that usually includes exterior trim and a threshold (also known as a door sill).

Replacement Window Installation

Replacing old windows isn't the same as replacing an exterior door. Instead of removing the entire window unit, usually only the window sash (the frames that contain the glass) are removed. Then a replacement window unit is installed inside the old window frame, which remains in place. When homeowners are interested in new windows, what they really mean is that they want to have replacement windows installed.

Although they may seem simple in comparison to a furnace, heat pump, or water heater, windows and doors have actually become fairly complex over that last 20 years or so.

Windows and doors used to be made only from solid wood, but today you can buy vinyl windows, vinyl-clad wood windows, aluminum-clad windows and fiberglass windows. These new windows never need painting and typically feature tilt-in sash to make cleaning easier. Likewise, the newest exterior door technology involves covering a core of rigid foam insulation with a durable fiberglass skin that has the surface texture and tone of different types of wood.

Most replacement windows and new entry doors feature insulated glass that reduces energy loss and cold drafts during winter weather. Different coatings and films can be used on the glass or between panes of glass to further improve energy efficiency.

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