Gas, Electric costs etc
With my 1976 electric Westinghouse "Heavy Duty"

dryer, it just has two thermostats.
(1)The High one always has its contact closed, and only opens when a gross over temperature/failure occurs. ie the lower temp guy fails closed. This prevents a fire.
(2) The Low temp thermostat on mine is the cycling/control thermostat that is in the exit tube. Mine is at something like 145 or 155 F in the open switch condition. It recloses probably somewhere between 10 to 15 F lower.
Thus when an electric dryer like mine is filled with a mess of damp clothes, the element runs at 5400 watts and is always on. Then when the exit/exhaust temp rises to 145 F the element turns off. Once the clothes are starting to dry out a good bit, the temperature rises in the drum to where the element is cycling on and off. Since water going to vapor requires a lot of heat ( about 1000 BTU per pound of water ) ; it takes time to vaporize the soggy blue jeans's water if there is a poor extract.
With this old electric dryer there is a low setting too, here the element has one side tied to hot, one to neutral and one gets just 1/4 the power, ie about 1400 watts instead of 5400. One gets a tad more than 1/4 since the element is not glowing and its resistance is a tad less. This setting is for delicate stuff, and was rarely used before I got the new FL washer recently. Today I sometimes use it for T-shirts and shirts, where I want more fluffing and less heat.
Using an electric dryer is dumb *IF* one has massive amounts of clothes to dry. One spends about twice the money on heating, since using gas is cheaper for heating than electricity. With electric one has the basic only 1/3 efficiency of a power plant's thermal cycle. The benefit is not 3, more like 2 to 2.5 since one has moisture and losses in the home dryer.
Here the dumb "auto-dry" setting of the dumb 1976 electric dryer works well with the new LG WM2501HV FL washer.
I really do enough washing to justify a gas dryer. A typical load with mine is dry in less than 30 to 45 minutes, and the 5400 watt element was cycling during the bulk of the time. A normal load measured draw of my stuff is only 1 to 2 KWhr, about 3 with a giant rarer load. The average load of mine costs 25 to 30 cents to dry. With gas I could cut this in half; ie save 15 cents per load. If I did 4 loads a week, this saves my 60 cents; or roughly 30 bucks per year.
If one has a big family and does alot of washing, a gas dryer makes more sense