Somfy Motorized Shades: The Complete RTS Buyer's Guide for 2026

Motorized window treatments are one of the highest-impact upgrades in a smart home — they change the daily experience of a room in a way that a smart plug or a color-changing bulb simply can't. Somfy has been the dominant name in motorized shade and drapery technology for decades, and its RTS (Radio Technology Somfy) wireless protocol remains the backbone of most professional-grade motorized window treatment installs in the U.S. today.

Why Somfy RTS Is Still the Standard

Somfy's RTS protocol is a proprietary wireless system built specifically for motorized shades and drapery — not a general-purpose smart home protocol like Z-Wave or Zigbee, but a purpose-built radio system tuned for reliable, long-range control of motors. That specialization matters: RTS motors and controls have a well-earned reputation for exceptional long-term reliability in an application (motorized window coverings) where failures are especially disruptive.

RTS devices pair using a simple button-press process, communicate directly with each other without a mandatory hub, and can be layered with repeaters to extend range across large homes — a genuinely different design philosophy from mesh-network smart home protocols, and one that's proven itself over many years of installed systems.

Drapery Motors: The Core of a Somfy Installation

Irismo 45 WireFree RTS Motor

Irismo 35 (Mini DC) RTS Motor

The Somfy Irismo 45 WireFree RTS Drapery Motor is a battery-powered traverse drapery motor — a genuinely wireless install with no line-voltage wiring required at the track, making it a strong retrofit option for existing drapery tracks. The Somfy Irismo 35 (Mini DC) RTS Drapery Motor is a compact, lower-profile version of the same concept, suited to lighter drapery loads or tighter track housings.

For larger or heavier window treatments, the Somfy Maestria RTS 525A2 Motor steps up to a hardwired, higher-torque tubular motor designed for roller shades and larger drapery applications where a battery-powered motor isn't sufficient.

Wall Controls: Local Control Without a Hub

DecoFlex 1-Channel Wall Switch

DecoFlex 5-Channel Wall Switch

Somfy's DecoFlex wall switches pair directly with RTS motors for wireless, battery-powered wall control — no low-voltage wiring needed, which is a major advantage for retrofit installs where running new wire to a wall switch location isn't practical. The 1-Channel DecoFlex controls a single motor or motor group, while the 5-Channel DecoFlex lets one wall-mounted control manage up to five separate shade or drapery channels — a practical choice for a room with multiple windows or a whole-floor control point.

Automating Shades with Weather Sensors

Ondeis Rain & Sun Sensor

Eolis Wind Sensor

One of the most practical automations for motorized exterior shades and awnings is weather-based response, and Somfy builds this directly into its RTS ecosystem with dedicated sensors. The Somfy Ondeis WireFree RTS Rain & Sun Sensor can trigger shades to close automatically when rain starts or sun intensity crosses a set threshold — useful for protecting outdoor furniture or reducing solar heat gain automatically rather than relying on someone to notice and respond manually. The Somfy Eolis RTS Wind Sensor serves a critical safety function for retractable awnings and exterior shades: it automatically retracts the shade when wind speed exceeds a safe threshold, protecting the motor and fabric from wind damage that a manually-operated system wouldn't catch in time.

Building a Complete System

A typical Somfy RTS installation for a mid-size home combines:

• Motors matched to the treatment type and load — Irismo for drapery, Maestria or similar tubular motors for rollers/shades
• Wall controls (DecoFlex) at convenient locations, sized by channel count to the number of independently-controlled groups
• An RTS repeater if the home is large enough that range becomes a concern
• Weather sensors (Ondeis, Eolis) for any exterior shades or awnings that benefit from automatic protective response

Somfy RTS motors and controls can also integrate with broader smart home platforms via third-party gateways for voice control and scheduling, but the core RTS system itself works reliably as a standalone wireless system — no mandatory app, no cloud dependency for basic operation.

Quick Reference

FAQ

Q: Do I need to rewire my window treatments to add Somfy RTS motors?
A: No — RTS motors like the Irismo line are designed as retrofits for existing drapery tracks and roller shade tubes. Wireless models (Irismo WireFree) run on battery power with no wiring at all; hardwired models like the Maestria connect to standard line voltage at the window, but neither requires new low-voltage control wiring to a wall switch.

Q: Can I control Somfy RTS shades with Alexa or Google Assistant?
A: RTS itself is a proprietary protocol, not natively voice-compatible. Voice control requires a third-party RTS-to-smart-home bridge/gateway. For a fully hub-integrated Z-Wave shade experience instead, see our RYSE SmartShade guide, which uses a different retrofit approach with native app and voice assistant support built in.

Q: How many motors can one DecoFlex wall switch control?
A: The 1-Channel DecoFlex controls a single motor or group of motors wired to respond to the same RTS channel. The 5-Channel version lets one wall switch manage up to five independently controllable channels — useful for a room with several windows you want to control both together and separately.

Q: Is the RTS Repeater necessary for every installation?
A: No. Most single-room or single-floor installations work reliably without a repeater. It becomes worthwhile in larger homes, homes with dense wall construction that attenuates RF signal, or installations where motors and wall controls are spread across multiple floors.

Not sure which motor size or wall control layout fits your window treatments? Call our tech support team — we can help you spec the right combination of motors, controls, and sensors before you order.