Manufacturers test coverage claims in an open warehouse with no interior walls. Real houses have plaster, plumbing, and — the biggest signal killer — mirrors and appliances.
When one router is enough
If your home is under 1,800 square feet on a single floor with a router placed centrally, a well-positioned single router with strong 5GHz output usually covers it. Look for a router rated for at least 2,500 sq ft on the box to leave margin.
When to go mesh
Multiple floors, a detached garage, or more than two interior walls between your desk and the router are the three signals we look for. A two-node mesh kit solves most two-story homes; add a third node only if you have a basement or finished attic you actually use.
The setup most people get wrong
Placing the second node too far from the first is the most common mistake — each hop should stay within about 30 feet of open-air line of sight, or the mesh backhaul degrades faster than the coverage gain is worth.