Our heat is always set to the same (fairly low) temperature, but some days it just feels colder. I know we lack insulation so I think on the colder nights you can really feel the cold pressing in on you.
I've been layering shirts differently Instead of tshirt + sweater. Right now I have a long shirt on (almost long enough to be a dress) a shorter long sleaved shirt and then a tshirt over that. And if I was still chilly, I'd put my house sweater on, one that buttons up instead of a pullover. For some reason, long sleave with tshirt over feels warmer than the other way around... and the long shirt really helps keep the lower back/hips warm. I hadn't realized how chilly that area was!
Other than that: wool slippers cut from felted sweaters, sewn boot style to keep ankles warm. Fleece liners. Socks.
Flannel pants or sweat pants. (something thicker).
Blankets on couch etc to snuggle in.
Move around and exercise when cold. Indoors or out. Actually, doing work outside (shoveling driveway etc) then coming back in makes me realize how warm the house is. ;)
Sip warm beverages, eat soups and stews; hearty food!
When all else fails, I take a long hot bath for those chilled to the bone/can't get warm evenings then go to bed and read.