Model 165 Construction Thermostat. Economical Construction Site Temperature Control. Install in Place of Standard Thermostat. During Construction: • Maintains Heating Temperature Set Point at 65˚ F • Tamper-proof Design Prevents Temperature Adjustment • Sturdy Enclosure Protects Switch from Drywall Dust, Painting and Mudding. Operating Voltage: 18 to 30 VA Maximum Current: 1.0 Amp.