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Managing the temperature inside your house is an important part of controlling condensation. Condensation can only form if there's a cold surface where the moisture can pool, so keeping windows and walls warm is essential. During the cooler months, use your furnace to increase the temperature, especially if humidity levels start to get too high. Use a hygrometer to keep and eye on the humidity levels in your house. If the humidity levels start to exceed 50 percent, take steps to lower the humidity and increase the temperature until the humidity drops below 50 percent. This will prevent cold air from blowing in from outside and cooling walls and windows. Not only will weather stripping save you money on energy bills, but it will also stop condensation. Weather stripping is a protective strip that you can apply to doors and windows to prevent cold air from seeping in through joints and frames. Cracks and openings are another place where cold air can steal into your house. Around doors and windows, you can seal these with caulk to prevent walls and windows from cooling. To apply caulk, you'll need a caulking gun and a fresh bottle of caulk. After you apply the bead, smooth it down with a small knife or your finger to press the caulk into the hole. This is a heat exchanger with a built-in ventilation fan. These devices are expensive (a couple thousand dollars), but they will help reduce your energy costs by preventing energy loss. And because this device will increase the temperature of your house, it will help you fight condensation. Another way to prevent condensation is to stop the windows from getting cold, and you can do this by installing storm windows, or by replacing older single-pane windows with double or triple glazing. While replacing windows or installing storm windows may be expensive, it will also help to improve the energy efficiency of your home, so you'll save money on your power bills.
Keep your house at the right temperature. Install weather stripping. Seal cracks around windows and doors. Install a heat recovery ventilator. Install storm windows.