When we bought our house, we moved our furniture in slowly, over a month's time. We were painting and doing work and honestly, I didn't feel like our house was really homey
until we had our living room set up with a couch and computer. We were really
lacking a comfortable space to unwind at the end of the day.
Also, warmth. Whether it comes in the form of cranking your heat up, having throw blankets to cuddle with, pillows on couch, slippers, whatever. In October we had gutted a portion of our house just before the first snowfall. Being cold = being miserable.
For adding coziness: lamps instead of just overhead lighting, books, a couple pretty things that mean something to you, some simple throw rugs near door, in front of kitchen sink etc. If you have kids, a couple baskets of toys.
It doesn't have to cost much, you can find plenty of great deals at thrift shops.