I don’t write a ton of reviews but figured I would for this app. It works to control the thermostat. That’s about it. Apparently the variable speed furnaces won’t work with other smart thermostats or I would replace it. It is very simplistic and hard to use. They could drastically improve their ratings (if they care) if they just had someone write a new app that sort of looked nice and was easy to use. If you use any other smart thermostat apps (ie Nest) you will be disappointed.

Had to have installer replace face of thermostat downstairs. From that point on, I have lost control via the phone app. I removed the downstairs system and added it back, which then updated all the current info. But then, the current status of the system would never update. So I’m stuck looking at whatever the thermostat was reading at the time I added the system online. Any changes I make via the phone app do not save or go into effect on the actual thermostat. Serial number, MAC address, and PIN numbers have all been updated. I go online to try to change settings and it tells me I need Adobe flash player that no longer is supported or works. Observer corporate needs to hop into the current decade with their software design.

It mimics the thermostat interface. Works just fine. I do wish it updated the display a little more often, as it sometimes seems to go a few minutes without updating what I change at the wall thermostat, or the actual ac unit takes a few minutes to engage whatever change I put into the app interface. Not always, but sometimes. It really does usually work pretty well. I haven’t had any bug issues others reported.

Had to have my Observer wall unit replaced. Deleted the old unit off my account and added the new one and reconnected the app. Could control original unit from app. Now changes on the app do not change the wall unit and the app just resets back to the wall unit settings every time. Very disappointing given todays technology.