The Truth About Energy Loss
Windows and doors are big holes in your walls. They let heat escape in the winter and sneak inside during the summer. You might think you need brand new windows to lower your energy bills. That is not always true. Often, a cheap tube of caulk saves more money than a huge renovation. Your HVAC system works hard to keep you comfortable. Do not let that conditioned air leak outside.
Finding the Leaks
You cannot fix a draft if you cannot find it. Wait for a windy day. Hold a lit stick of incense or a candle near the edges of your windows and doors. If the smoke blows sideways, you have a leak.
You can also wait until dark. Have a helper stand outside with a bright flashlight. Turn off the lights inside and look for light shining through the cracks around your doors. Anywhere light gets in, air gets in too.
Repair or Replace
How do you know if a window is dead? Some problems are easy to fix. Others mean the window is ruined. A broken glass seal or a rotting frame cannot be saved with caulk.
| Problem | Action | Estimated Cost |
|---|---|---|
| Drafty edges | Caulk or weatherstrip | $10 to $30 |
| Cracked glass pane | Replace glass only | $150 to $300 |
| Fog between panes | Replace glass unit | $200 to $400 |
| Rotting wood frame | Full replacement | $600 to $1,200 |
Keep in mind that these costs are just estimates. Prices vary heavily by your region, the scope of the work, and the age of your home.
Weatherstripping and Caulking
Caulk seals gaps between the window frame and the wall. Weatherstripping seals the moving parts. You need both to stop drafts. Remove old peeling caulk before you apply new stuff. Use a good exterior grade silicone caulk on the outside of your house.
For moving sashes, stick on some foam or rubber weatherstripping. This takes a few hours and costs very little. If you notice soft wood around the frame while you work, you might have bigger issues with your exterior siding.
Window Replacement Costs
Sometimes you just need new windows. Single pane windows are terribly inefficient. If your house still has them, upgrading makes a huge difference. Vinyl windows are cheap and need zero maintenance. Wood windows look beautiful but cost more and need paint. Fiberglass sits in the middle.
If you hire someone to install them, check their references. Read our guide on hiring contractors to protect yourself from bad work.
Remember that these are ballpark numbers per window. Prices change based on your region, project scope, and home age.
Upgrading Your Exterior Doors
Your front door takes a beating from the sun and rain. Wood doors warp and swell. If your door sticks in the summer but shows gaps in the winter, the wood is moving. Fiberglass doors are a great upgrade. They look like wood but never warp. Steel doors are very secure and cheap, but they can dent and rust. A solid door also helps boost your home security.
Do not forget the door sweep. This is the rubber strip at the very bottom of the door. It drags on the threshold to block wind and bugs. Sweeps wear out every few years. You can unscrew the old one and slide a new one into place in five minutes.
Dealing with Condensation
Water droplets on your glass can be tricky to diagnose. If the water is on the inside of the room, your house is too humid. Turn on your bathroom fans. If the water is trapped between two pieces of glass, the window seal is broken. The insulating gas leaked out.
You cannot fix a broken seal. You have to replace the glass unit or the whole window.
If you see lots of bugs near a rotting frame, you might need pest control to clear them out before you put a new window in.