Straight Replies

Usually not. Many smart-home devices only support 2.4 GHz, and it reaches further than 5 or 6 GHz. Leave all bands on and let devices choose. More in Frequency Bands.

No. Mesh helps when one router cannot cover the home. In a small flat it adds little, and wireless mesh nodes placed too far apart can slow things down. Wired backhaul gives the best results. See Router Placement.

Floors often contain concrete, joists, pipes and insulation that weaken signals more than walls. A router low on the ground floor sends much of its signal into the floor. Raise it, centre it, or add a second access point upstairs.

Yes, on 2.4 GHz. Microwave ovens operate at about 2.45 GHz and a small amount of leakage is normal. Use 5 or 6 GHz nearby or move the router away from the kitchen. See Interference.

Only if your devices support it and you need very high local speeds. A connection runs at the level of the older device, so placement and backhaul usually matter more.

Around −50 dBm is excellent, −60 to −67 dBm is good for most uses, and readings near −75 dBm or lower often bring slowdowns.

Plain glass has little effect, but energy-efficient low-E glass has a metallic coating that can weaken signals considerably, which matters for gardens and outbuildings. See Building Materials.

Both use 2.4 GHz, but Bluetooth hops between narrow channels and avoids busy ones, so in most homes the effect is small.

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