Need to know how to replace 4 wire Mear m21 thermostat to a two wire Honeywell RLV4305 thermostat
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Need to know how to replace 4 wire Mear m21 thermostat to a two wire Honeywell RLV4305 thermostat
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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