Congrats on the house!!
When we moved into our home, I took the cats over the night before...the cats got to spend the night in our new home before we did.
Then, the morning of, before we started bring things in, I penned the cats in the bathroom with food and water and litterbox, of course, since it was the one room I could guarantee would not have any boxes to go on in there. As well as, the bathroom is pretty decent sized.
After we brought in the last load, I let the cats out of the bathroom, while we returned the truck.
By doing it the way I did, taking them over the night before, is this way they could check out their new home in total comfort.
Good luck to you.....I know how exciting it is to finally have a home of your own. I've been a homeowner for almost 6 years. The only thing that sucks, is there's no landlord to call when something major breaks.