You don't know who lived there before you. Professional cleaning before you move your belongings in is one of the most impactful things you can do for your new home.
Even a freshly painted home has years of accumulation in overlooked spots: inside cabinet hinges, under appliances, in HVAC vents, behind toilet bases. Previous owners cleaned to their standard — not necessarily yours.
The window of opportunity: An empty home is dramatically easier to clean thoroughly than a furnished one. Take advantage of that window before any furniture arrives.
Change your HVAC filter the day you move in. You have no idea how old the existing one is. Consider having the ducts cleaned if the home is older or if previous owners had pets.
Most sellers have their home professionally cleaned at move-out. But move-out cleans are done to pass inspection, often on a deadline, by cleaners who aren't invested in your comfort. A fresh move-in clean to your standard is worth doing regardless.