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.

Who Should Buy This

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.