Honeywell RTH8500D Touchscreen Programmable Thermostat

If at all these features are all you need, then you should definitely opt for this thermostat as there's no other one with such variance.

Hold Options - There's an option to override until the next program scheduled or until you cancel it yourself. Also, there's the vacation hold feature wherein you would be able to hold it for a number of days after which it would return back to normal.

Automatic Switching - If your home needs both heating as well as cooling you would previously need to switch over manually. However, this programmable thermostat has the ability to switch over on its own.

Single and Multi Stage capabilities - This model is perfect for both, single as well ass Multi stage functioning. Both, heating and cooling and hence works well with all home.

Easy Programming - Initial programming as well as the changes you make later on (if necessary) are really easy and even if you've never handled a thermostat before, you would be able to do it easily; provided you know how to operate a touch screen device!

Reminders - You don't need to worry about running out of battery as it alerts you when the battery is running low. In addition to this the filters too are well maintained as you are alerted when they need cleaning.

Memory - In case of power outage you need not worry as the program isn't forgotten. Hence you wouldn't need to program it from scratch at every power failure. 

Installation is a breeze - If you've installed a thermostat before, this isn't any different and you would be able to compelte it in a matter of minutes. However, if it's your first time, just follow the instructions in the manual and you're done. 

7 day, 4 events programming - As already mentioned, it doesn't just provide you with a 7 day program, it's also got the capability to work differently based on 4 special events. 

Great display - The back light display can be clearly read under any lighting conditions.

There's just one possible problem that the Honeywell RTH8500D thermostat could face:

The Touchscreen - As we all know, touch screens tend to lose their sensor capabilities after a few years (As in the case of mobiles). But, mobiles are constantly in use and therefore, you shouldn't fiddle with the touch on this model a lot. Only use it when necessary, this would improve its overall lifetime. 

Before you buy the Honeywell RTH8500D programmable thermostat or any other electrical appliance, you should always ask yourself - 'Would it work at home?'

This model was built for the following operations:

1. Single as well as multistage heating and cooling
2. Only Heating or Cooling
3. Central Air Conditioning
4. Heat Pumps - With and without auxiliary heat
5. Steam and Gravity
6. Hot water heaters
7. Fireplaces operated by gas as well as
8. Other 750 Millivolt uses

Honeywell has plenty of thermostats and they all differ in a few features. If you're looking for a quick compare, this table of comparison would surely help.