Turn off the

heating/cooling system.

Turn off the

power to that system on your main electrical panel.

Remove the

cover of your existing thermostat. (Often this is as easy as just pulling

it firmly toward you, but you may need a screwdriver for one or two screws.)

Mark the wires

from the wall (positive, negative, ground). Scribble their designations

on small pieces of tape, if need be, and attach each tape to its corresponding

wire. Chances are these are going to be color coded, but even colors will

fade over long periods of time.)

Remove the

old thermostat base. There will probably be one or two screws to loosen.

On the new

thermostat, there should be a base plate which you can then attach (probably

with a couple of screws) to the wall.

If you haven't

already, read the instructions that come with your new thermostat.

Connect the

wires from the new thermostat to the wires from the wall per instructions.

At this point,

it may be necessary to make one or two small adjustments to the new thermostat,

depending on the type of heating system you have.

If battery

backup is provided, now is the time to affix the batteries.

Attach the

new thermostat's cover plate. Often, this is only a matter of snapping

it into place.

At your main

electrical panel, turn on the power to the heating/cooling system.

Set your temperatures,

times and days.

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