Frequently Asked Questions



  • Reduce Energy Costs
  • Reduce Noise Pollution
  • Security Advantage
  • Virtually Maintenance Free
  • Economical
  • Easily Customized
  • Wide Selection of Styles
  • Easily and Quickly Installed
  • Increases the Value of Your Home!


When to Replace

  • Deterioration is present
  • Quick-fix repairs are not doing the job
  • Windows or doors won’t slide
  • Drafts occur
  • Windows are painted shut and won’t open
  • Windows won’t lock
  • When you want to beautify and modernize your home
  • While remodeling


Take advantage of benefits listed above. For unbiased information on the benefits of energy-efficient windows, descriptions of how they work, and recommendations for their selection and use, please visit call or fill out our Request Form.

About Ratings - Heat Gain & Loss

Windows, doors, skylights can gain and lose heat through:

  • Direct conduction through the glass or glazing, frame, and/or door
  • The radiation of heat into a house (typically from the sun) and out of a house from room temperature objects, such as people, furniture, and interior walls
  • Air leakage through and around them

These properties can be measured and rated according to the following energy performance characteristics:

U-factor is an indicator for how insulating your overall window is. The lower the U-factor number, the more energy-efficient the window/door is. Especially important in colder climates.

Solar Heat Gain Coefficient (SHGC) is the amount of heat the window absorbs and transmits to the inside of your house. The lower the SHGC, the less solar heat it transmits and the greater its shading ability. A product with a high SHGC rating is more effective at collecting solar heat during cooling loads during the summer by blocking heat gain from the sun. Your home’s climate, orientation, and external shading will determine the optimal SHGC for a particular window, door, or skylight.

Air leakage is how much air is leaking into your house through the window when there is a pressure difference. Typically, drafty homes have high air leakage windows and doors. A product with a low air leakage rating is tighter sealing than one with a high air leakage rating.


Sunlight Transmittance

The ability of glazing in a window, door, or skylight to transmit sunlight into a home can be measured and rated according to the following energy performance characteristics:

Visible Transmittance (VT) is how much visible light is going into your house through your window and door. A product with a higher VT transmits more visible light. VT is expressed as a number between 0 and 1. The VT you need for a window, door, or skylight should be determined by your home’s daylighting requirements and/or whether you need to reduce interior glare in a space.

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Contact Us


Lancer Windows, Inc.
3150 E. La Palma Ave. #J
Anaheim, CA 92806


714.543.3530 - Sales
714.632.1105 - Office
714.329.1452 - Cell


Lancer Windows, Inc. dba Lancer Construction #921025 /

    Specializing in custom windows and doors for residential homes. Contact us today!