Constantly incorrect temperature

I purchased this in April 2017. I immediately noticed that the temperature it displayed was incorrect. I called Honeywell and was told it took a little while for the unit to obtain the correct temperature. Over the last few months, this has been a continuous problem and I have called three more times. My latest call was today, and I was told that a variance of two or more degrees was completely normal. So, that means that I have set at 76 and it is really 78 (as it is now), then I have to manually change the temperature. What is the point of having a programmable thermostat which requires constant manual intervention? They refused to replace it under warranty. I have another of these thermostats in another home and it works fine. If you read the reviews, this appears to be a consistent problem. I would avoid this thermostat and look at one which is more accurate.

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