Simple to operate and easy to install! Compatible with standard or ducted rooftop or basement installations. System switch: selects cooling or heating system: air conditioning, furnace, heat pump or electric heat strip. Fan Switch: auto and on settings for thermostatic or blower-only operation. Hi/low switch: selects fan speed for optimum comfort level ("hi" for fast temperature adjustments, "lo" for quieter, continuous operation). Slide lever: sets desired temperature; graduated in both Celsius and Fahrenheit scales. For: Brisk Air, 640312-640315 Penguin.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov