Small cleanup to thermostat keys

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ee3253a) 65.25% compared to head (2804edf) 65.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #48 +/- ## ========================================== - Coverage 65.25% 65.00% -0.26% ========================================== Files 6 6 Lines 803 800 -3 ========================================== - Hits 524 520 -4 - Misses 279 280 +1 ``` | [Flag](https://app.codecov.io/gh/bdraco/nexia/pull/48/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J.+Nick+Koston) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/bdraco/nexia/pull/48/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J.+Nick+Koston) | `65.00% <100.00%> (-0.26%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J.+Nick+Koston#carryforward-flags-in-the-pull-request-comment) to find out more.

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