It actually depends where the dimmer fails if it stays on or off. I had a 2 $40 heavy duty dimmers do it so you can't say a reliable dimmer cant fail. I'll be happy to send you the model and you can see they were reliable. Thing is they failed at the adjuster themselves. Also there not made for what we use them for. People often are going to buy the cheapest dimmer they can find.
Yes I'm sorry I should of said you cant keep a bp without regulating the heat source. That was my point and I should of voiced it better. I would also like to add that a drastic change in room temp with a dimmer can be just as harmful as having nothing to regulate your heat source. Like if you have your heat going bc its 30 at night and you wake up and go to work and temps during the day reach 70 and your house is really hot when you come home and then your temps in your enclosure will higher. Bottom line in my experience I don't think a heat regulating device should be skimped on do to the reasons I stated and they are all experiences I've had. Also a quality thermostat like any electrical device can fail but have a decreased chance of doing so.
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