using different cups to reduce heat loss
?
installing carpets
reduce heat loss
They hold heat inside of the object NOOO! That's wrong ^ Insulation materials reduce heat loss because they are poor conductors. So please please don't put the first answer!
The darker the color is, the less heat radiation occurs.
Float on your stomach with arms and legs extended.
A vacuum between two glass sheets will greatly reduce heat loss through convection, and also through conduction. The fact that the glass is coated (to convert it to a mirror) also reduces the loss by radiation.
They both reduce heat loss in the house ;)
They are poor conductors
It insulates the window and keeps heat in.
Doggie sweaters
To reduce heat loss by thermal radiation.