Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: does it have an emergency heat button?
Document: Nor do I remember if the slightly newer models were available with emergency heat capability as they are now.Using it for the past seven months has been pretty good, actually. It works the air conditioning mode just fine. The programming is easy and I like that you don't have to individually set all seven days with four settings. The backlight is very useful and day-to-day operations are easy. Setting it for a "vacation mode" is likewise easy.
My service contract for my brand-new heat pump meant I had two techs and a supervisor on the phone trying to puzzle out why this thermostat wouldn't switch on the emergency heat. All three of them said, and I quote: "Huh. I've never seen that before. A heat pump thermostat without emergency heat? Crazy. "I suppose there's nothing really WRONG with this product, but I could have sworn I read the description forward & backwards when I bought it and I don't recall hitting this little detail.
The RTH6500D 5-1-1 was very easy to install with excellent directions. Works great! Back lighting only lights when a button is pushed, but you can still read the temp/ect fairly easily.
I just wanted to comment on some reviews of this thermostat. Some reviewers state that to get the backlight to come on you have to press a button, and by pressing that button it changes some settings. I just piddled around with my unit, and have come to the conclusion that if you want the backlight on, just press either the "up" or "down" buttons. Pressing either one of these will make the backlight come on, but will not change any settings.
fine device, works well and simple to operate, no problems. but for us there is a major issue that makes no sense. the face lighting does not last long and therefore hard to see the face if you just are walking by and want to check the temperature, etc. one needs to touch any button to get it on for a few seconds but that will disturb the settings. from that aspect it is a poor design.
You have to press the run schedule again to retain back to normal. That is the only annoying part. I bought this unit for 2 reason, one is the Font size and the second is backlight. I hope the newer product will retain the light longer than 2 seconds, and there will be a button for backlight. Besides the minor glitch, the unit is good. 4 stars.
Programming on this model consists literally of pushing the same button again and again to cycle through your programming, and you need only hit the up/down buttons to change time and temp. Couldn't be easier. I've ordered two more.Also, ontrary to what one reviewer said, pushing the button at night to get the backlight to turn on does NOT change the setting. You have to hit the button twice to do that. Night viewing is easy to read.
The unit is well designed and visually appealing.When reading previous reviews, I had some concerns that almost caused me to not order the product. Luckily, I found that none of these issues presented a problem for me. Here are some of the problems discussed in previous reviews, followed by my answers:1) Issue: There is no dedicated backlight button and it is not possible to activate the backlight without pressing a button which will then alter thermostat programming.
The product came with easy instruction on how to install the unit. It only took me 15 mins to finish the setup. I like the big screen and the 7 days program which my old unit didn't have. The instruction for setting up the program is very easy to use. The only thing I would complain is the backlight; it only last 2 to 5 seconds and it doesn't have a button for backlight. In order to see at night, you have to press any of the button.
It's nice to wake up in the morning in a heated room without having to leave the heat on all night.
Answer: yes