Installing GLAS® is easy.

What’s in the box?

  • GLAS smart thermostat with anodized metallic finish
  • Quick start guide
  • Installation guide
  • Paintable back plate
  • Screws and drywall anchors
  • 4-5 Wire Adapter


GLAS works with most 24 volt heating and cooling systems, including: gas, electric, oil, radiant, and forced air. Just remove the faceplate from your current thermostat and confirm you have the following labeled wires:

  • Power (C, RH, RC)
  • Conventional (2H/2C), (W1, W2, Y1, Y2)
  • Heat Pump (O/B)
  • Fan (G)
  • Humidifier, Dehumidifier, Ventilator, HRV, ERV (AUX)

Technical features.

GLAS’s powerful capabilities are a product of forward-thinking engineering and cutting-edge thermostat design. The sleek 5.5” x 5” x 1” thermostat is the first of its kind to incorporate a translucent OLED touchscreen.

Download specs & requirements.


How are my energy savings calculated? How do I schedule a vacation? Get answers to your GLAS questions.

Browse FAQs