Save money, energy and peace of mind with the Pro1 app. Operate your thermostat from anywhere. You can adjust the temperature, schedule, setbacks and even receive alerts when your system is not performing properly. Feel comfortable from anywhere.

What’s New

Version 1.1.0

Changes in version 1.1.0
- Temporary and Permanent Holds for the T855i can be set and cleared from the app
- menu and navigation buttons are bigger and easier to click
- thermostat model appears correctly in the Thermostat Info View
- misc. bug fixes

Ratings and Reviews

1.7 out of 5
135 Ratings

135 Ratings

Rtm56 ,

Not an improvement at all

Connecting and set up was a breeze but that is where it stops. The app shows one setting, the thermostats do not match. Let me set the stage: we are in Central Florida where the temps are in the high 80’s to low 90’s every day. Today the settings on my app for one of our buildings were at 78 all day yet the inside temp shows to be 76. How can that be unless the actual setting on the thermostats are lower than the app tells me? In our kitchen (another building) we set the thermostats to 70 remotely yet I’m told the display reads an 83 degree setting. Very hard to deal with while we are open for business; to find that the reason it’s so hot is that the thermostats are set higher than the app shows. Needs to be fixed. Finally, the temporary hold gives a confirmation that the hold is in effect until 7:00 pm regardless what the default 4 hour gap gives you. Too many headaches!

slammin ,

Angry...just spoke to customer service

UPDATE 2 - Finally got them reconnected after a 6hr drive one way. While here, Spectrum internet went down for a couple happens. BUT, thermostats never reconnected. Called CS and was told they only try once to reconnect after 15 mins. I need to be physically at the thermostat and ADD THEM AGAIN!!! He said if the power goes out, same procedure. These things are not worth it at all. I have received a refund from my contractor and now have NESTs. They work...all the time. They reconnect.
Goodbye to the was not fun! BUYER BEWARE!!

UPDATE...just spoke to customer service. You have to be physically in front of your thermostats to add them to the new app. Old account information does not transfer. If you have these in a vacation home, get ready to travel!!! Btw, mine are two weeks old. I was just there to have them installed. Spoke to customer service multiple times during setup navies of their ‘server issues’. I was never told this was going to happen. Very irritated!
I use this app to control the thermostats in my beach house...6 hrs away. Now, with abrupt update, I am completely in the dark. App will not accept my existing ID and password.

Developer Response ,

We’re sorry to hear you are having frustrations connecting the PRO1 Connect App with your thermostat. This one-time migration was necessary to build the new infrastructure required to support enhancements and new features requested through HVAC Technician and Consumer feedback. We are positive that you will be delighted with the new features & functions that are soon to be released once the required server migration process is complete.
To aid in the migration process, we have a step by step connection overview on our website: You can also reach us at or call us at 1-800-776-1559 – Press 1 immediately when the prompt begins.
We appreciate your business and look forward to assisting you.
Thank you for choosing PRO1

Starsfan9192 ,

New App is horrible!!!

When I first got the unit they had the old app which was amazing. I never had an issue! For 6 months I totally bragged on this unit!! When the new app came out it took me two days to get it working again. It worked for a couple of months only saying the unit wasn’t connected to the internet just every couple of day. The past two weeks unless I am home and connected to my wifi I can’t use the app to change my temperature! It constantly says not connected to the wifi. If you back out on the screen that list all thermostats it shows to be working. They other thing is the time says it is in central time zone which is my correct zone, but it is an hour off. Right now it is 11:10 pm and my apps thinks it is 10:10! I have tried resetting my wifi. That didn’t help. I really don’t want to delete the thermostat because it will take days to connect it again. I called and left a message for the customer service, still waiting on a call back two months later 🙄!


30 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2019


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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