• Parts you need to change a thermostat.Klimaanlage image by Imagemaker from Fotolia.com
  
  It's 80 degrees outside and your air conditioner doesn't seem to be turning on. You play with the slider on your manual thermostat, yet nothing happens. It may be time to change your thermostat. The process can be moderately easy as long as you have the right parts for the job. The parts needed to replace a thermostat can vary depending on the type of thermostat you decide to install.
  
  

New Replacement Unit

• You will need to purchase a new model thermostat to replace your existing model. There are many different styles, models and price points available depending on your existing HVAC system and personal needs. Manual thermostats are the cheapest and simplest to install. You can purchase the round style (most popular) or a rectangle shaped unit. Digital thermostats are more complex, but can be more efficient for your energy bill. Be sure to read the instructions on the box before installing any new thermostat to ensure you have the correct type for your current HVAC setup. Visit your local home improvement store or search online for a model that fits your needs, budget and personal style. If you are not comfortable with installing the unit yourself, contact a local HVAC company to perform the install for you.
  
  

Recommended Installation Tools

• Gather the following tools and parts before de-installing your old thermostat. You may not need all of these tools, depending on the model or type of thermostat you install, but you will be prepared for any situation that may arise. Include in your kit: small Flathead screwdriver, Philips-head screwdriver, needle nose pliers and wire strippers. Have a pencil handy to mark any screw holes (if changing the actual shape of the housing unit on the thermostat) and a cordless drill with bits (optional) if you have to make new drywall screw holes. A small level can help ensure that the unit is positioned square on the wall.
  
  

Cleanup

• You may need a bit of touch-up paint to cover any area of the wall that may be exposed if your replacement unit was smaller then the original unit, or if you made any scrape marks installing the new unit. A vacuum will clean up any drywall dust on the floor from the new screw holes. Once the replacement unit is installed, a damp cloth can be used to periodically clean off any dust from the thermostat. Depending on the type of thermostat installed, you may need to calibrate the new unit. Having a stand alone thermometer to compare the temperature on from the new unit's settings could increase the effectiveness of the new unit.
  
  

Disposal of Old Unit

• Unless your old unit has a mercury vial in it, you can dispose of the unit in the trash. Check with your local county/city office on how to dispose of units with mercury vials.