How to Block Cold Air From a Chimney


Regardless of how chilly the weather is outside, the presence of a fireplace that really functions brings visual as well as aesthetic warmth to a space. The negative is that a fireplace needs ventilation via the chimney, which means that air that is warmer inside will rise out of the chimney, while air that is colder outside will sink into the chimney. This cool air causes an increase in heating costs because it requires additional energy to bring the temperature of the room up to the level that is desired when there is a constant influx of cool air into the space. Accessories for the fireplace and chimney that are developed expressly to avoid heat loss assist to keep the air from the outside where it belongs.

A Door with a View

A glass door that is built to fit in front of a fireplace not only helps to prevent chilly air from leaking into the room via the fireplace, but it also adds a sense of style to the space and prevents children and dogs from accidentally touching the inside of the fireplace. Some of these are more decorative than functional; rather than an accordion-style screen, look for a door that seals over the opening in your window or door.

While the fireplace is not in use, a quality glass door seals off the opening to prevent chilly air from entering the room. At the same time, the door permits access to the fireplace even when the fire is blazing. When the fireplace is in use, even toward the end of the evening, glass doors may be closed to provide more privacy.

Chimney-Top Chill Blocker

When the fireplace is not in use, the damper located within the chimney, right above the firebox or area where a fire is lit, assists in preventing draughts of cold air, as well as the entry of birds and other animals. This kind of damper is often crafted from cast iron, although it does not provide full protection against heat loss or draughts. According to Home Saver, a chimney-top damper will have a flap or lid that will fully cover the top of the chimney. Additionally, this kind of damper will include a rubber gasket to prevent air from the outside from getting inside.

When the fireplace is being used, the chimney-top model of the damper remains open. This serves the same purpose as the inside damper, which is to operate as an exhaust to pull gases out of the home. Climbing up onto the roof and positioning this cap atop the chimney are both necessary steps in the installation process; the details depend on the brand and type. The top damper may be opened and closed using a pull chain located within the chimney.

Pillows, Plugs and Balloons

According to Cozy Indoor, gadgets such as pillows, plugs, and balloons are all meant to retain warm air inside of a house while allowing chilly air to remain outside of the property. These reusable plastic gadgets may be installed into the chimney, just above the firebox. The act of filling this with air causes it to expand, which fills the inside of the chimney and prevents air from entering from the outside. When it is time to utilise the fireplace, it is much simpler to draw it down and remove it if it has been deflated beforehand.

This inflatable fireplace draught barrier is available in a variety of standard forms and sizes to accommodate chimneys of varying dimensions. When the fireplace is not being used, these air cushions are employed in the same way as other techniques of preventing cold air are used.

Foam Insulation Solution

Foam insulation, much as it is used in other parts of the house, may help prevent draughts from coming in via the chimney or fireplace. A piece of dense insulating foam, the kind that is supplied in huge sheets for use in building projects, should be cut to the dimensions of the aperture in the fireplace so that it can be pulled out like a panel. Cover the piece in a beautiful fabric that coordinates with the design of the space, and then secure the cloth with pins on the reverse side to create a visually appealing method of preventing cold air from entering the area.