On the scale of DIY projects, from replacing a light bulb to re-building your entire house, how difficult is it to replace the thermostat?
Or, more specifically, to upgrade from an old metallic thermostat to a newer digital model? Will I have any interface problems? The furnace in my house is close to 25 years old, so will a new digital thermostat have any interfacing problems?
And is this the kind of thing that should be attempted on your own, or should I call a qualified electrician for this?
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