New Hampshire in the winter is cold. And that cold wants to suck the heat out of my house from every crack.
I got a fun new toy for Christmas that lets me point an infrared thermometer at any surface to measure its temperature. So now I know that the temperature around the sliding glass door in my bedroom is 50F!
Ah, but when I close the curtains across that doorway, the temperature on the inside of the heavy curtain is 60F! It feels warmer already.
Air is a good insulator. Cloth traps air well, which why quilts have been used for so long to help keep people warm. Quilts or cloth on your windows or around edges of doors can help cut down on energy used for heating and save money.
Now that I know I changed the temperature by 10 degrees, I should be able to estimate that savings… I’ll go do some math and get back to you.