Why the Wi-Fi is bad in a big house

This is the most common call we get, and the most commonly misdiagnosed. Somebody has a large house in Houston or the Hill Country, the Wi-Fi is unreliable in three rooms, and they have already spent money making it worse.

The instinct is that the signal isn't reaching far enough. Range is almost never the problem.

What is actually going wrong

Wi-Fi is a two-way conversation. Your router can shout across the house; your phone cannot shout back. A device four rooms away may see a strong signal on screen and still fail, because its own transmitter is a fraction of the power of the one in the ceiling.

Then there is what the house is made of. Foil-backed insulation, plaster over metal lath, tile, brick, low-e glass and mirrors all attenuate 5GHz badly. In a large Texas house, the walls do more damage than the distance.

And finally there is interference from your own network. Two access points on the same channel don't add up. They talk over each other, and the devices in between spend their time deciding which one to listen to.

In practice — the dead spot over the garage is usually not a coverage problem. It is a device that has latched onto a distant access point and refuses to let go, because nothing has told it to.

Why extenders and mesh make it worse

A range extender receives a signal and rebroadcasts it. Everything it carries makes the trip twice over the air, which roughly halves the throughput for every device behind it. Two extenders in series is a quarter.

Mesh systems are the same principle with better marketing. They are genuinely good in an apartment or a small house where running cable is impossible. In a large house they are a compromise being sold as an upgrade, and stacking more nodes to fix the problem adds more wireless hops.

The clue is in what a mesh node wants: it wants to be wireless. The fix for a big house is the opposite.

What actually fixes it

Wired access points, in the right places, on the right channels.

Each access point gets its own network cable back to a switch, so nothing is being relayed over the air. Placement is designed rather than guessed, usually ceiling-mounted, more of them than people expect, each running at lower power rather than fewer running at maximum. Channels are planned so neighbouring units don't collide, which matters more the more units you have.

Turning the power down is the part that surprises people. A quieter access point means devices hand off to the nearest one instead of clinging to a distant one, and the whole house gets faster.

In practice — a house that needed three access points at full power usually works better with six at reduced power. It costs more in hardware and less in service calls.

When it isn't the Wi-Fi at all

Sometimes the network is fine and something else is wrong: an overloaded internet connection, a failing switch, a device with a bad driver, or an ISP router quietly running its own competing Wi-Fi network that nobody turned off.

That last one is common enough to check first. If your provider's box is still broadcasting alongside your system, half your devices may be on the wrong network entirely.

What to ask before anyone quotes you

Ask whether the access points will be wired or wireless. Ask how many, and why that number. Ask whether channel planning is included, or whether the units will be left on automatic. And ask what happens after installation, whether anyone will look at the network again, or whether you will be the one who notices when it degrades.

If your Wi-Fi has never been right, we would be glad to look at it properly rather than add another box to it. Send us a note through the site, or call or text the office at 832-295-9098.

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