This little guy has been running our heater and small air conditioner perfectly for the past few months. It's pretty damn accurate so far - we've held the thermometer close to its sensor, and at worst it gives an error of just 0.2°, but typically says 0.0°. If you don't want to reprogram it, you can easily customize it with the included symbol meaning cheat sheet. If you need to reprogram it regularly and can't remember a bunch of codenames for values, don't lose the cheat sheet that explains how to reprogram it. That's my only gripe, but considering how precisely it regulates temperature and that it has a programmable swing value, I find it difficult to program it without having a sheet with you.
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