Fixing the gap between your air conditioner and window frame is essential to ensure proper cooling efficiency and prevent unwanted drafts. Fortunately, there are several simple and cost-effective solutions you can try on your own. Here are some DIY methods to fix the gap without spending much money:
Weatherstripping: Weatherstripping is an effective way to seal gaps around the air conditioner unit. You can purchase weatherstripping foam tape or self-adhesive weatherstripping strips from a hardware store. Cut the weatherstripping to the appropriate length and apply it along the edges of the window frame where the gap exists. Make sure to clean the surface before applying the weatherstripping to ensure a good bond.
Foam insulation: Foam insulation is another affordable option for sealing gaps. Expanding foam insulation products can be found at hardware stores and are easy to use. Spray the foam into the gap around the air conditioner, and it will expand to fill the space. Trim any excess foam after it has dried.
Window insulation film: Window insulation film is a thin, transparent plastic film that can be applied to the interior of the window frame. It helps create an additional barrier against drafts and heat loss. This film is inexpensive and easy to install with double-sided tape and a hairdryer to shrink it for a tight fit.
Foam pipe insulation: Foam pipe insulation tubes are cost-effective and readily available at hardware stores. They come in various sizes, so select one that fits the gap around your air conditioner. Cut the tube to the required length and fit it into the gap, providing an insulating barrier.
Use draft stoppers: Door draft stoppers or "draft snakes" can be repurposed to fill the gap. Place the draft stopper along the bottom edge of the window frame where the air conditioner sits to block drafts and improve insulation.
Use a wooden board: If the gap is significant, you can cut a piece of plywood or a wooden board to fit the opening. Slide the board into the gap when the air conditioner is not in use to seal the window effectively.
Before attempting any DIY fixes, make sure to clean the area around the gap to ensure better adhesion and a proper seal. Keep in mind that while these solutions can help reduce gaps, they may not be as effective as professional installation or weather sealing. If the gap is too large or if you notice any safety concerns, it's advisable to consult a professional HVAC technician or seek assistance from a qualified professional.