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    Handy2016's Avatar
    Handy2016 Posts: 1, Reputation: 1
    New Member

    Dec 10, 2016, 11:17 AM
    Replace Mear m21 thermostat
    Need to know how to replace 4 wire Mear m21 thermostat to a two wire Honeywell RLV4305 thermostat
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
    Uber Member

    Dec 10, 2016, 12:35 PM
    Typically a 4 wire would be for heat and air while a 2 wire is heat OR AC only. Is that what you have?

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