Um yeah! My thermometer on the front porch reads <30° which is cold for Swampfox country. The clouds have rolled away as the sun dances slowly higher amongst the bordering pines. Frost wisps away in curling fingers reaching skyward, twisting intricately. Keeping efficiency in mind, this is the season to do early morning walks around the home taking note of what surfaces have frost layered on them. Where you see this is actually a good sign! The surfaces without frost are energy (heat) leaks, these require attention and insulation. In doing so the cost of both heating and cooling a structure can be trimmed as much as possible.
Here is a link that has pictures which show the value of insulating your roof.