How to Install Thermal Windows

October 11, 2010

How to Install Thermal Windows

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For handy homeowners, installing thermal windows can save a significant amount of money on heating and cooling costs. What is the difference between thermal windows and traditional windows? Thermal windows feature double- or triple-panes, while traditional windows are single-paned.

Typically, today's thermal windows deliver two-to-four times more energy efficiency than single pane windows, which means many homeowners could see a 20 percent to 30 percent drop in their winter heating bills. Another advantage is that vinyl thermal windows can eliminate the extra step of painting.

Here is a quick overview of how to install thermal windows:

Installing Thermal Windows in 10 Steps

  1. Measure the regular window at top and bottom for the width, and at both sides for the height dimensions.
  2. Remove the old single-pane window.
  3. Take care to gently remove the trim and the upper and lower stops.
  4. Gently place the thermal window in the opening, making sure you know which side should face outside and which should face inside.
  5. Once the window is secure in the opening, shim it on all sides, making sure it is level and plumb.
  6. Use the screws provided by the manufacturer to secure the window in place. Be sure not to over-tighten the screws to avoid warping the frame.
  7. Open and close the window to check if it works properly.
  8. Nail the wood back around the window and install the old trim.
  9. Then use caulk to seal the exterior gap between the new thermal window and the window opening.
  10. Use glass cleaner and a soft cloth to clean the window.

If you follow the manufacturer's instructions on how to install thermal windows, you should be able to do it without problems.

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