Unless you have high efficiency windows, investing time and money in weatherizing windows can save your energy dollars and improve indoor comfort. Glass by itself is a poor insulator, and since heat is always moving to cooler temperatures, windows can contribute to significant air conditioner energy losses.
Energy Efficiency and Windows
Windows transfer heat through the glass, the frames themselves, and any leaks present between the glazing or the joint between the wall and frame. Slowing the heat transfer and reducing air conditioner leakage improves energy efficiency and cuts conditioning bills in proportion to the size and placement of the windows.
How to Weatherize
Replacing your windows with Energy Star or thermal-rated windows for the northern climate is the best option, but if your budget won’t allow it, consider these options for weatherizing windows to reduce the heat and air movement:
- Cover them – Investing in thermal drapes or window coverings will keep the heat outside or inside year-round. Look for heavier fabrics that have a lining or foam backing. It’s best when they completely cover the window area and lie close to the wall. Keep them closed when you want to prevent heat transfer.
- Seal them – Using caulk to seal leaking frames will stop air leaks, as will using V-weatherstripping inside the frames should the glazing not fit tightly. If you have divided light windows with loose panes, use rope caulk or clear fingernail polish to seal the leaks. Simply locking the windows also cuts air conditioner energy losses.
- Add panes – Clear plastic window sealing kits are available at home centers, or you can add clear interior storm panels to create an insulating air space. The panels are available from local or online providers.
- Eliminate drafts – Seal the drafts that occur at the window base by using a draft stopper on the sill.
To learn more about weatherizing windows to help keep energy costs down, contact Gartner Heating & Cooling or call 847-448-0596 today.
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