There's no single right answer to how often a home should be professionally cleaned, but there is a right answer for your home. It comes down to three things: how many people and pets live there, how quickly dust and mess build up, and how much of your own time you want to spend keeping up.
Weekly cleaning suits households with young kids, pets that shed, or anyone who simply wants the house to feel freshly cleaned every few days. Kitchens and bathrooms never get a chance to build up grime, and floors stay clear of tracked-in dirt.
Every other week is the most popular choice for a reason. It keeps the house consistently clean for most families and couples, and in between visits a quick wipe of the kitchen and a vacuum here and there is usually all it takes.
Monthly cleaning works well for smaller homes, single-person households, and people who keep things tidy day to day but want the deeper work handled: scrubbed showers, dusted fans and baseboards, and mopped floors.
In the Phoenix area, desert dust is the wild card. Homes near open desert, like those in Anthem and Cave Creek, collect dust faster, so many clients there lean toward a more frequent schedule. Whatever you choose, starting with a deep clean gives every recurring visit a clean baseline to maintain.