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I am installing a honeywell RTH111 thermostat. The old
I am installing a honeywell RTH111 thermostat. The old thermostathas only 2 wires with no letter designation on either of the two screws. do I just install the un-identified wires on R and W of the ne… read more
Phil
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Replacing an old thermostat with a new RTH111. The new one has to have 5 wires hooked up,and the old one has only 4 wires ( blue, green, white, red.with ared runner from the red to the white one ) How… read more
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Meet the Experts:

Phil

Phil

Mechanical Engineer

7,634 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

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Matthew

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Brian HVAC Guy

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Kenton Guidry

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Rick Ridley

Rick Ridley

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Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

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16+yrs HVAC/R service. Residential Commerical Industrial

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