This Python 3 (tested with 3.9.3) script builds on the (https://github.com/alecvance/Nestlogger) script to provide additional tools to maintain your Nest thermostat.

In addition to logging data from your thermostats, it can optionally email you an alert when the relative humidity is above a certain amount, and set your thermostat's target temperature when using cooling mode in order to deal with excessive humidity. The Nest thermostat has a "Cool to Dry" feature, but it will not let you use it at temperatures below 80 degrees (F) for some mysterious reason when you're in normal/home mode, and below 75 degrees when in away/Eco mode. This script allows you to take control of your thermostat without these restrictions.

In order to authenticate using this script you will need a developer token. The steps are generally outlined below. For specifics, see the Nest Developer site.

To get an access token:

1. Get a Nest Developer account.
2. Create and register a Nest app from your Nest Developer account and set privileges on your Nest app.
3. Use OAUTH to setup and authorize your Nest device with the code.
4. Get the access token for your Nest account to connect to the app.

Once you have a token:

5. Rename sample.config to nest.config and put your access token in there.
6. Install Python 3 if necessary.
7. Run the script from a terminal: "python3 nest.py", or add to your crontab to run periodically. For example, here is mine that checks thermostats and runs every 15 minutes: */15 * * * * cd ~/Nestools/ && /usr/local/bin/python3 nest.py

Each run will append to log file(s); there is a different log file for each thermostat.

The log files show the following per line in order: datetime, inside temperature, inside relative humidity, current state, target temperature.

Temperatures are in Fahrenheit, but can be changed to Celsius with little effort.

If wish to use the email alert system, enter your email address and smtp server and port in the config file. You may also wish to adjust the maximum relative humidity (max_rh) before alerts occur.

If you have more than more thermostat on your account, you can set a different max_rh value for each. See the sample config file for the section header format.

• I created this script because our South Louisiana house traps humidity and Nest's "Cool to Dry" feature will not activate if the temperature is less than 75-80 degrees. (If Nest engineers lived in a very humid environment like the Gulf Coast, they might realize that this is a ridiculous limitation.)