Preparing your home for the cold is vital to staying comfortable and saving on energy costs as winter approaches. While you might be thinking about checking your furnace or sealing up drafty doors, one area you shouldn’t overlook is your windows. Old or inefficient windows can let cold air in, drive your energy bills up, and make your home less comfortable.

But how do you know when it’s time to replace them? Here are five signs that your windows might need an upgrade before winter arrives.

1. Drafts and Cold Air Leaks

If you feel a breeze near your windows—even when closed—it’s a telltale sign they aren’t sealing properly. Drafts can result from old weatherstripping or worn-out window frames that no longer fit snugly. This allows cold air to seep in, making your heating system work harder and increasing your energy bills. If you’re constantly trying to compensate for cold spots with blankets or space heaters, it’s probably time to replace those drafty windows.

How to check: On a windy day, hold your hand near the edges of your windows. If you feel a slight breeze or cold air, it’s a clear indicator that the windows aren’t performing as they should.

2. Condensation Between the Panes

Seeing condensation or fog between the panes of double or triple-glazed windows means the seals have failed. This breaks the insulating barrier meant to keep the warm air in and the cold air out. When this happens, not only are your windows less effective at insulating your home, but moisture can also accumulate, leading to potential mold or mildew issues.

Tip: Wipe the glass to ensure the condensation isn’t on the interior or exterior surface. If it’s trapped between the panes, it’s a seal problem, and you should consider replacing the window.

3. Difficulty Opening or Closing Windows

Windows that are difficult to open or close or that get stuck aren’t just an inconvenience—they’re a sign of aging frames or warped materials. In older windows, wood can swell, metal components can rust, and frames can bend over time, making the windows tough to operate. When this happens, they no longer close tightly, which means you could be losing heat and energy efficiency.

Solution: If your windows feel jammed or you have to apply a lot of force to open or shut them, it’s a sign they’ve outlived their effectiveness.

4. High Energy Bills

One of the most obvious signs that your windows are past their prime is a sudden spike in energy bills. Inefficient windows allow heat to escape during the winter, causing your furnace to work overtime to maintain a comfortable temperature. This can significantly increase your heating costs. If you’ve taken other energy-saving measures (like upgrading insulation or sealing doors) and still see high bills, your windows are likely the culprit.

Energy-saving tip: Modern energy-efficient windows are designed to prevent heat loss, and many come with features like Low-E glass or gas fills between panes, which can help reduce heating costs.

5. Visible Damage or Decay

If your windows show visible signs of wear—like rotting wood, cracked glass, or chipped frames—it’s time to replace them. Damaged windows not only reduce your home’s energy efficiency but can also impact its overall appearance. Cracked or broken glass can let in cold air and create safety concerns, while decayed frames might invite pests or moisture inside.

What to look for: Inspect your windows for obvious signs of damage, especially around the frames and sashes. If you notice rot, soft spots, or signs of water damage, those windows won’t hold up well through a cold, wet winter.

When to Replace Your Windows

If you’ve noticed any of these signs, it’s a good idea to replace your windows before the cold weather sets in. New windows from established manufacturers like Casa Bella Windows & Doors can improve your home’s insulation, lower your energy bills, and make your home more comfortable throughout the winter months.

Winter is just around the corner, and the last thing you want is to spend the season battling drafty, inefficient windows. By replacing old windows now, you can avoid the discomfort and high heating bills that come with poorly insulated homes. Take a close look at your windows —if they’re showing any of these signs, it might be time for an upgrade.