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I have a honeywell 9421 thermostat connected to an EIM. They
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Meet the Experts:

Phil

Phil

Mechanical Engineer

8,427 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

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Matthew

Matthew

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Brian HVAC Guy

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Tom

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A-1 Tech

A-1 Tech

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