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. I've installed several in my home and found it genuinely straightforward for anyone comfortable with basic electrical work.

Installation: What You Actually Need

The HS220 fits in a standard single-gang US wall box. You need a neutral wire (white), a line wire (black), and a load wire. The included instructions are clear. With the breaker off, the swap takes about 10 minutes.

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. I've used this feature during vacations and it works as advertised.

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. I tested with Philips dimmable A19 LEDs and GE Reveal dimmable LEDs without any flickering across the dimming range.

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.

Review Notes After Three Installs

For this review I drew on three HS220 installs in my own house over two years: living room, hallway, and a kid's bedroom. How easy is the install really? The first one took me 25 minutes because I double-checked every wire against the guide. The third took 8 minutes flat. If you can wire a ceiling fan, this is comfortably within your skill set. If you've never opened a switch box, watch one video first and keep the breaker off the entire time.

None of the three switches has dropped off Wi-Fi in two years. That's worth saying plainly, because cheap smart switches are notorious for needing weekly re-pairing. The oldest unit has executed a 9 PM dim-to-30% schedule roughly 700 times without a miss.

What you get for around $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

The one genuine limitation is the neutral wire requirement. In a pre-1985 house, check the switch box before ordering. Past that, the HS220 is about as low-friction as smart lighting gets.

A few real-world 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%. During a power outage, the HS220 comes back in the off state and reconnects to Wi-Fi on its own within about a minute of power returning. I never had to re-pair after an outage, which was a recurring chore with an older brand of switch these replaced.

The faceplate situation is also worth a sentence. The HS220 ships with its own wall plate, but it also fits standard decorator-style plates if you want to match existing switches in a multi-gang box. The body is deeper than a dumb switch, so a crowded three-gang box with thick 12-gauge wiring gets tight. In my hallway install I spent more time folding wires neatly than connecting them.

Firmware updates arrive through the Kasa app a few times a year and install in under two minutes. None of mine has ever failed an update or lost its schedule afterward. It's an unglamorous detail, but smart home gear lives or dies on this kind of maintenance reliability.

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. At $20, it undercuts Lutron Caseta significantly (which requires a $100 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.