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Fiberglass vs Vinyl Windows

Replacement Windows Houston

Today’s home windows should supply comfort for its occupants as well as keeping energy bills as low as possible. Replacement windows can change a house’s appearance and make it more attractive. When the right windows are chosen, they will not only look good outside but make the interior more comfortable as well.

When thinking about whether to repair or replace a window in your home there are certain indications that show replacing windows in your home is the best way to go.

  • These indications are:fiberglass vs vinyl windows
  • Cracked glass
  • High energy bills
  • Damaged frame or sill
  • Unable to move window due to old paint and/or broken sash weight cords
  • Deters from the appearance of the house

If you have any or all of the above then it would make more sense to replace, rather than repair, your windows.

One way you can determine how badly you need to replace your existing windows with energy saving ones to have a window audit. This energy audit involves having a qualified technician who will carefully check windows and doors for air leaks. He or she will be able to tell you changes that need to be made if your home is to have protection from outside heat and cold.

Two windows that are at the fore on today’s energy saving window market have frames of Fiberglass or Vinyl. Mass-produced in regular and custom sizes, by nationwide companies, windows with metal frames are less expensive than wooden framed ones. Each frame has specific properties, which should be considered when thinking about replacement windows.

Fiberglass Windows

Fiberglass window frames are made of a polyester resin that is heated with threads of glass or glass mate impregnated. Stronger than vinyl, fiberglass offers the option of being having wood veneer trim, which can be left in its natural state or painted. Windows with this frame are exceptionally energy efficient.

Windows with Fiberglass frames are considered more ‘upscale’ than Vinyl and are stronger with less chance of warping. Because it has more glass space than Vinyl, it is approximately 15-30% more expensive.

Records show that Fiberglass window frames can be approximately nine times stronger than Vinyl frames and are advertised to have a 38% longer lifespan. This is because it has a glass source, which enables it to contract and expand without breaking the window seal.

Vinyl Windows

Vinyl window frames have extruded PVC (polyvinyl chloride) as their material base. Different structural elements are used to stiffen the frame and may contain metal.

Vinyl windows come with baked on color frames. This means that the frame cannot be painted to match surrounding areas in comparison to Fiberglass windows, which are paintable. As stated above, their construction allows both window frames to have excellent insulation qualities.

Vinyl is not as strong as Fiberglass and requires more room for the frame. Therefore, with stronger frames, there is not as much glass available to allow light in a room. Although they do not last as long as Fiberglass frames, there is a considerable difference in price.


Both Fiberglass and Vinyl window framing is made from materials that do not rot nor attract bugs such as termites, which is often the problem with wooden frames.

If it is decided that new windows are required it is important to check out their:

  • Energy efficiency
  • Matching home design
  • Performance record
  • Required maintenance
  • Type of frame
  • Price

When the right windows are selected, there are many benefits. These include keeping the house warm or cool and reducing your utility bills. These windows will last for many years, improve the appearance of your home and increase its value.

Contact Entrust Replacement Windows Company for a free in-home estimate.