FAQ for homeowners

Thermal deflection is a rare, natural phenomenon that can occur when sunlight reflects off of a surface with enough heat to distort siding or other materials. The damage can be to one’s own residence, or to a nearby home.

How does it happen?

A combination of various factors needs to be in place for the thermal deflection phenomenon to occur, including some or all of the following:

  • Certain times of year and sunlight angles
  • Close proximity of home exterior walls
  • Structure design
  • Surfaces such as window glass, roof shingles, asphalt or swimming pools that could reflect sunlight
  • Heat radiating from nearby surfaces such as driveways, air conditioning compressors and barbeque grills
  • Lack of trees and shrubs, fences and cloud cover to divert sunlight

Are the products involved in thermal deflection defective or were they improperly installed?

No, a thermal deflection incident does not necessarily indicate that product performance or installation were improper. The natural phenomenon instead indicates the presence of some or all of the above factors.

What can I do to avoid, or stop, thermal deflection?

Unfortunately, it is difficult or even impossible to predict if thermal deflection is going to occur in any particular situation. Nevertheless, to minimize your risk you can:

  • Use full screens in your windows
  • Use trees and shrubs to block or diffuse the sun’s rays

What do I do if it happens?

The homeowner should contact their insurance company, and see if it is covered by their policy.

For more detail, you can refer to the study sponsored by the U.S. government and conducted by Ernest Orlando Lawrence Berkeley National Laboratory or the research by Cardinal IG (glass manufacturer).

Blinds Between Glass stay dust-free, are safe for children and pets, and are easy to care for and operate. These videos show you how to care for your Blinds Between Glass and how to use them for optimal convenience and enjoyment.

  • Blinds Between Glass raise and lower with the use of magnets inside the glass and on the external operator. Occasionally, the operator can come loose from the internal magnets, causing the blind to not operate properly.
  • Although Blinds Between Glass never require dusting, the glass itself must be kept clean to ensure easy operation. If operating your blind is taking more force than usual, you might need to clean the glass.
  • If your Blinds Between Glass have been in a raised position for a long time, the blinds might now lower properly when first lowered. “Exercising” the blinds will correct this issue.
  • Occasionally when operating Blinds Between Glass, the blind might become out-of-level, with one side of the blind being higher than the other.
Watch Helpful Care and Use Videos

First, find the warranty label on your window or door product. Can’t find the warranty label? Email us.

If you need to replace the pivot bar, visit our web page for instructions. If you need other replacement parts, please call Field Service at 1-800-822-0437, fill out our Customer Service form or email us. Please be prepared to provide us with the following product information:

  • Order Number
  • Product Type
  • Date the Product was Installed
  • Description of the Defect

To see the current list of job openings at Harvey Building Products, click here.

We appreciate your feedback. Please visit our Customer Service page with issues or suggestions.

Warranties and product service for other products distributed and sold by Harvey Building Products must be claimed through the vendor of that product. Please visit the vendor’s website for specific information.

Please visit our Warranty Information page and look for your product.

If you’re having trouble with your Harvey window or door, please visit our Customer Service page.

Storm windows, window films and interior doors are not eligible for ENERGY STAR® at this time.

Cleaning the Glass

A simple soap solution with clean water and mild detergent, or a standard commercial household glass cleaning product, should be applied to a grit free cloth or sponge to gently clean glass surfaces. It is recommended to remove any excess cleaning solution with clean water, and use a squeegee or lint free dry cloth to remove any excess water from the glass.


  • Do not use rust removal products, abrasive cleaning agents with cerium oxide (such as Soft Scrub®), razor blades, sandpaper, or other sharp instruments on glass surfaces.
  • If using a squeegee, be sure it is free of any debris which could scratch the glass surface during use.
  • Be careful not to damage glazing or insulating unit seals by overgenerous application of cleaners.
  • If using standard glass cleaning products, be sure to follow manufacturer’s directions on label for proper handling and warnings.

Cleaning the Wood or Vinyl Frame

We suggest the same cleaning methods above to clean the wood or vinyl frame of your windows. However, if you decide to use other products please consider the following warnings.


  • If any cleaner or solvent is used on the vinyl or wood frame around the glass, care should be taken to avoid overspray onto the glass. If overspray does occur, it should be wiped off immediately.
  • The use of sandpaper, razor blades, steel wool, emery paper, or products with cerium oxide will leave fine scratches on the vinyl or wood surface and could be damaging. To avoid damage, sample test an inconspicuous area of the frame with the cleaning solution and method of your choice.
  • Be sure to follow manufacturer’s directions on label for proper handling and warnings for any products you use.

Majesty wood windows must be finished with stain, polyurethane, or paint within 48 hours of installation.*


  • Apply one to two coats of stain (wiping the sash after each application).
  • Apply two coats of polyurethane and sand with fine steel wool after drying.


  • Apply one coat of primer.
  • Apply one to two coats of paint.

*NOTE: All exposed wood must be properly sealed within 48 hours upon installation. Harvey will not be responsible for water staining, discoloration, etc. resulting from condensation or moisture that takes place before units are finished on the interior.

Please refer to the Harvey Majesty wood window warranty for exclusions and limitations.

Please visit our Support Center for videos about operating, caring for, and cleaning of Harvey windows.

You cannot rest the air conditioner directly on the vinyl sill. We suggest you put a 2 x 4 into the sill track that measures 1″ or 2″ higher than the sill so the air conditioner can rest on it or ask your contractor to use our A/C Sill Adaptor. Perfectly suited for A/C installations.

To learn how easy it is to replace your pivot bar please watch our How To video, “How to Replace the Pivot Bar on Your Harvey Double Hung Window” on our YouTube channel.

To order the proper part for this replacement please visit our Support Center.

There are a few reasons why your sash may not operate correctly. Please visit our Support Center for videos about operating, caring for, and cleaning of Harvey windows.

There are a few reasons why your window may not tilt in or close completely. Please visit our Support Center for videos about operating, caring for, and cleaning of Harvey windows.

To determine which type of vinyl windows are in your home, you must locate the warranty label on your window. Please refer to our Warranty Information page.

Caring for your Harvey windows is one way to ensure that they remain easy to operate and last for a lifetime. Read through our Harvey window care and cleaning instructions or watch our videos.

Windows serve as visible areas for moisture to condense to warn you that there is too much moisture in the air inside your house. To learn more about what causes condensation on windows refer to our Condensation Causes and Cures page.

If you have a question we haven’t answered here, please visit our Customer Service page and submit your information.