If you were to cut a hole in your ceiling, then hang a heat source there, you would create what is called the chimney effect.
The warm air would rise into the attic, a barely perceptable area of low air pressure would be created below the heat source.
Air from nearby would come to fill in the low pressure area.
That air would be heated, then it would rise, and the cycle would continue.
Recessed lighting fixtures that are not air tight are heat sources just like that.
When you install non air tight recessed lighting cans in you home, you spend an awful lot of money heating your attic.
The good news is they do make recessed lighting fxitures that are air tight.
The designation of these can is “AT”, which as you can guess stands for “air tight”.
It is easy to tell air tight can from non air tight cans:
- There are not holes or slots in the outer housing.
- When you look up into the can from below, it is a metallic color whereas non AT cans are white.
When you buy recessed lighting for your home, make sure the can are designed AT as well as IC (insulation contact).
And speaking of recessed lighting for your home ….. we would love to install some for you when you live in or near San Jose.