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How To Stop Heat Transfer In Your Home

Cellular Shades covering a window.

You’re wasting a lot of energy if you only worry about your windows during the cold winter months. This is because windows can allow a lot of hot air to seep into your living space during the summer and lose conditioned cool air, making your home uncomfortable and raising your AC bill. Insulation’s primary function is to slow heat transfer into and out of a home. Heat transfer can take three forms: convection, conduction, and radiation. In an ideal world, an insulation material would prevent all three types of heat transfer.

Conduction of heat energy from homes occurs through the walls, floor, roof, and windows. Convection also transports it from homes. Cold air, for example, can enter the house through gaps in doors and windows, and convection currents in the loft can transfer heat energy to the roof tiles. Heat energy is also radiated out of the house via the walls, roof, and windows.

However, numerous small and large adjustments can be made to reduce heat transfer and conditioned air transfer. Here are the best tips for how to stop heat transfer in your home during the hottest months of the year.

There are several methods for reducing heat loss:

  • Installing carpets, curtains, and draught excluders are simple ways to reduce heat loss. Carpet and other fabric-type materials are better for absorbing thermal energy than wood and laminate.
  • Double glazing can help to reduce heat loss through windows. Air or a vacuum is sandwiched between two panes of glass in these special windows. There will be no conduction or convection if the double glazing has a vacuum. 
  • Convection is minimized when double glazing is made with air between the glass because there is little room for the air to move. Because air is a poor conductor, there will be very little heat loss through conduction.
  • Cavity wall insulation can help to reduce heat loss through walls. This entails blowing insulation into the space between the brick and the inside wall.
  • Because insulating materials are poor conductors, they reduce heat loss through conduction. The material also prevents air from circulating inside the cavity, reducing heat loss through convection.
  • Loft insulation can help to reduce heat loss through the roof. This works in the same way that cavity wall insulation performs.


First and foremost, use caulking and weather stripping to seal any leaks or cracks around your windows. You can seal up the inside and outside of your windows in a single afternoon with supplies from your local hardware store.

Adding a window treatment to the window must trap and hold air between the treatment and the window to be effective. Whatever treatment you choose, make sure it is as tight as possible around the window and about one inch away from the glass.

Cellular shades

Skip single louvred panels, whether made of aluminum or vinyl, if you want to maximize energy efficiency. Instead, look for shades with a cellular or honeycomb pattern. Although triple-combed shades are the most efficient, double-combed shades are less expensive and also help with insulation. Cellular shades work by forming an insulating air pocket in each cell, separating the window air space from the room air space. The blinds fold up into a thin band at the top of the window when not in use. When they’re down, they provide an effective barrier to outside air while still allowing enough light to make the room bright—unless you’ve chosen a blackout fabric. Install shades as close to the window to form a seal that reduces heat gain and loss.

Cellular shades in a sunroom.

Window Quilts that are Insulated

The quilts are attached to the window frame with Brand strips and can be removed and replaced depending on how hot (or cold) it is outside and how much air you want to block. Quilts are especially effective on French doors, which have large panes of glass that can be difficult to caulk and weatherstrip. Though they are extremely effective at creating an air barrier, they do not allow any light to pass through. They are more effective at night than during the day unless you are not at home and do not require daylight in your home.


Draperies can reduce heat transfer into a room by containing the air that enters the room through the windows in the space between the drapes and the windows and by preventing hot sunlight from entering the room through the windows and heating up the space. Drapes should be hung as close to the ceiling as possible, allowing them to fall onto the window sill or floor rather than leaving gaps that allow air to enter the interior space. The tighter the fabric’s weave, the more effective it is at blocking the air passage. 

Shutters and Insulated Panels

Shutters either fit snugly over the entire window, preventing air from escaping, or they fit precisely inside the window frames, sealing the windows completely when closed. They are made of a wooden frame covered in insulation and decorative fabric for an aesthetically pleasing appearance.

Window Replacement

If you’re looking for a more long-term solution, investing in new windows is the best option and the ultimate treatment!

If at all possible, avoid single-paned windows. A double-glazed window saves money by losing half the heat that a single-glazed window does. Triple glazing reduces heat loss by another 30% but is usually not cost-effective. With each additional layer of glass, the solar heat gain is reduced. This is a good rule to remember when replacing old windows or purchasing windows for new construction.

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