Home Tech: Leak Stopper

The average heating and cooling duct is about as airtight as a sieve and totally inaccessible, which is why this magic leak-plugger made the cut. A vinyl-acetate-polymer mist pumped into ducts fills gaps as wide as your thumb, sealing your system tight.

Aeroseal Duct Sealant, by AerosealFrom; $1,100; aeroseal.com
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