Kasa Smart Dimmer Switch HS220: Easy Wi-Fi Dimmer Install

The TP-Link Kasa Smart Dimmer Switch HS220 is a Wi-Fi enabled dimmer that replaces a standard light switch and adds app control, scheduling, and voice assistant compatibility without requiring a hub. At around $20, it's one of the best-value smart dimmer switches available in 2026. Installation is genuinely straightforward for anyone who has opened a switch box for anyone comfortable with basic electrical work.

One thing to state up front, because it changes how you should read the rest. This review is built on the spec sheet, the wiring requirements, and my own experience wiring a house for exactly this class of device. It isn't built on two years of living with an HS220, and I'd rather say that than pretend otherwise.

Installation: What You Actually Need

The HS220 fits a standard single-gang box. You need a neutral, a line wire, and a load wire. The included instructions are clear, and with the breaker off the swap is easy enough that the second one takes half as long as the first. Budget about 10 minutes once you know what you're looking at.

The most common installation issue is missing a neutral wire. If your existing switch has only two wires, you likely don't have a neutral. That's worth checking before buying. The HS220 installation guide shows how to identify your wiring type.

For multi-switch setups (3-way), TP-Link sells the KS230 Kit, which includes a primary smart dimmer and a compatible add-on switch.

App and Scheduling

The Kasa app lets you set schedules, sunrise/sunset triggers, and create scenes. You can dim to a specific percentage on a schedule - for example, 30% at 9 PM, off at midnight. The app is reliable and doesn't require a monthly subscription.

Away mode randomly toggles lights on and off to simulate occupancy, which is useful for security when traveling. It is the one feature people actually keep switched on after the novelty wears off.

Voice Control Performance

Alexa and Google Home integration works without a hub or bridge. The Kasa skill links your account and makes all Kasa devices available in the respective apps. Dimming with voice commands ("Alexa, set the living room lights to 50%") works accurately. Response time is typically under 1 second from voice command to light response on a good Wi-Fi connection.

Dimming Quality

The HS220 uses leading-edge phase dimming, which is compatible with most dimmable LEDs. At low brightness levels (below 15%), some LEDs flicker slightly depending on the specific bulb. Whether yours flickers is a question about the bulb as much as the switch, so buy one, try it on the fixture you care about, and only then buy the rest.

The physical paddle switch is responsive and satisfying to use. Tap to toggle on/off, hold to dim up or down. Works exactly as expected and feels like a quality switch mechanically.

What the Neutral Wire Requirement Really Means

The one genuine limitation is the neutral wire requirement. In an older house, check the switch box before ordering, because a switch loop with only a live and a switched live gives this dimmer nothing to run on.

This is the part I can speak to directly, because I made the opposite bet when wiring my own house. Every switch box got the deepest back box available, a neutral in every one, and the bulb permanently live with a controller deciding the light. All the lighting cable for a room lands in one box behind a single wall switch. No two-way circuits anywhere.

My electrician's reaction is the part worth repeating: he said the lighting was unusually simple, because there were no two-way or intermediate switching arrangements to run. Received wisdom says a smart home complicates the wiring. Here the copper got simpler, because control from several points moved into software instead of extra cable between switch positions.

That decision cuts both ways, and the honest cost is worth stating. When the hub is down, the lights do not work at all. The wall switch is an input to the system, not a break in the circuit. I accepted that deliberately, but it is exactly the trade a Wi-Fi dimmer like the HS220 does not ask you to make: it keeps working as a dimmer whether or not anything else on your network is alive.

What you get for around EUR 20:

• Wi-Fi dimmer with app, voice, and physical paddle control
• Scheduling, sunset/sunrise triggers, and away mode in the free Kasa app
• Works with dimmable LED, incandescent, and dimmable CFL loads from 10W to 150W
• No hub, no bridge, no subscription
• 2-year limited warranty

A few behaviors worth knowing before you buy. The switch remembers its last brightness level, so tapping the paddle returns the lights to wherever you left them rather than blasting to 100%. After a power cut it comes back off and reconnects on its own. That last detail is not a footnote: a device that waits for a human after the power returns is a device that fails the one night nobody is home to tap it.

The body is deeper than a plain switch, so a crowded three-gang box with thick cable gets tight. This is the argument for deep back boxes long before you know which brand you will buy.

The Right Buyer

The HS220 is the right choice for anyone who wants smart dimming without a hub and is comfortable with a 15-minute install. It undercuts Lutron Caseta, which needs its own hub for full smart home integration. If you need no-neutral wiring support, look at Kasa KS230 or Lutron Caseta. For standard 3-wire installs, the HS220 is hard to beat at this price.