Dimmers can work but the best setup is using a good quality tstat. I like Herpstat. When you consider how long they last vs price they are a good deal. Do it right the first time and get a good one.
The issue with a dimmer is they are not aware of the changes around them. If the room gets hot the dimmer doesn't know it and makes the uth hotter than it should be. A tstat in that same situation with a tstat keeps the uth at the desired temp because it knows the room got hotter. It works the opposite in a cold room.
A dimmer is best for rooms that have little to no fluctuation in temp throughout the day and year.
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