When the summer heat is blazing, your air conditioner is working overtime to keep your home cool. But if your house has air leaks, all that cool air (and your money) could be slipping right out the door or window. Sealing air leaks is one of the easiest and most cost-effective ways to boost energy efficiency and lower your utility bills. Here’s how to find and fix those hidden leaks before they cost you more this summer.
Why Air Leaks Matter in Summer
Air leaks don’t just let warm air in. They force your cooling system to work harder to maintain a comfortable temperature. This results in:
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Higher energy bills
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Uneven cooling and hot spots
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Extra wear and tear on your AC
Common Places Air Leaks Hide
Most air leaks are sneaky. Here’s where they tend to be found:
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Around windows and doors
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Electrical outlets and switch plates
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Attic access doors
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Recessed lighting
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Baseboards and crown molding
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Vents and ductwork connections
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Plumbing and wiring penetrations through walls
How to Detect Air Leaks
DIY Methods:
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Candle or incense test: Light a candle or incense stick and move it around suspected leak areas. If the flame flickers or the smoke moves erratically, you’ve found a leak.
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Flashlight test: At night, shine a flashlight around doors and windows while someone stands outside. If light leaks through, so does air.
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Hand test: On a windy day, feel for drafts with your hand near windows, baseboards, and vents.
Sealing the Leaks
1. Weatherstripping
This works well for sealing movable components like doors and windows. Choose the right type for your door or window and apply it to all edges.
2. Caulking
Use caulk to seal gaps and cracks in stationary parts like window frames, baseboards, and trim.
3. Spray Foam
Ideal for filling larger gaps around pipes, vents, and wiring where they enter your home.
4. Outlet and Switch Gaskets
Install foam gaskets behind outlet and switch plates on exterior walls to block airflow.
5. Duct Sealing
Leaky ducts can waste up to 30% of your system’s energy. Use mastic sealant or foil tape instead of standard duct tape. For the best results, consider professional duct sealing.
Bonus Tip: Insulate While You’re At It
If you’re sealing leaks, it’s a great time to check your insulation, especially in the attic. Proper insulation works together with air sealing to keep your home cooler in summer and warmer in winter.
Want a Professional Energy Efficiency Check?
At Arellano Plumbing Heating & Air Conditioning, we can help you seal those energy-wasting leaks and get your HVAC system running at top efficiency. Call us today for a home comfort assessment or to schedule your summer HVAC tune-up.
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