A three-minute DIY task using plastic insulation sheets on windows can keep rooms warm without turning up the central heating, according to money-saving enthusiast Leigh, who posts on TikTok as @financiallyfreeleigh.
Leigh, who has used the method for three years, said: "I've been doing this for the last three years; I will never go back. I don't feel the cold drafts anymore, and I save a bunch of money on my heating bill."
How the Trick Works
The plastic sheets are applied to the interior of windows to add an insulating layer that restricts heat transfer through the glass. Leigh highlighted that they "actually keep you warm by keeping the draught out and save you hundreds on your heating bill."
She added: "Takes like three minutes. So worth it. Who knew that a little bit of plastic can actually make such a difference. The windows in my apartment are so old, so they all have massive drafts."
Expert Views on Savings
Nick Barber, energy expert and co-founder of prepaid electricity company Utilities Now, told Better Homes & Gardens: "Plastic window wrap can absolutely be effective if used correctly. It acts as a temporary barrier that slows heat transfer through single-pane windows."
Barber explained that the plastic creates a pocket of trapped air between the film and the glass, similar to the gap in a double-pane window, which slows warm air from escaping and cold air from entering. He noted: "It won't fix all the energy gaps in a room, but it will slow down heat loss through glass significantly."
Discussing potential savings, Barber said: "Using plastic window insulation kits, homeowners can expect to save as much as five to 10% of their heating costs. However, this percentage still depends on the number of windows insulated and the size of the house, as well as the airtightness of the rest of the building."
Step-by-Step Application
To apply the sheets, start with clean, completely dry windows. If they are dirty, clean them thoroughly and let them dry fully.
Apply the double-sided tape provided with most kits around the interior edge of the window frame. For a DIY approach, use good-quality double-sided tape. Press the plastic film firmly onto the tape, ensuring it overlaps the window edges, then use a hairdryer to shrink the film until taut, which removes creases and improves the seal. Finally, tape over the edges to create an airtight seal.
