Reddit mentions of Nashone Wireless Temperature Controller,Electric Thermostat with Remote Control Built in Temp Sensor 3 Prong Plug LCD Display Heating Cooling Mode(wirelss thermostat)

The problem here is that you're trying to apply a solution that will end up causing more problems than it will solve. You're talking about staple-up radiant heat in a home with a thick decking subfloor (much thicker than the 3/4 OSB or plywood that's standard in more modern homes) that's below very old softwood floors that are likely to warp on you if you go through with your plan. On top of that, you're gonna be looking at running a 240v breaker for it (assuming your home's electrical can handle another breaker and the extra load, if it's even been upgraded to breakers from old Edison fuses and the meter has been upgraded from the old 60A - I see you stated elsewhere that the electrical hasn't been updated). You're talking a four, possibly five figure investment versus $200 in ductwork and an additional vent, or a simple space heater and a plug-in thermostat.

To realistically do this the right way, you'd need to first update all the electrical, pull up the flooring, install an appropriate system (hot water/glycol would be a better choice than resistive), and replace and refinish the floors.

My grandpa's house is 100 years old. I'm well aware of what happens when you start tearing into and modifying homes that old: nothing good. TBH, this should be near the bottom of the "honey do" list.

My house is decently insulated and the heat works fairly well, that is with exception of my bedroom. The bedroom is upstairs but only has a single radiator for what is the largest single room in the house. It's comfortable until the coldest parts of the cycle, and with one thermostat that's downstairs it's never going to get better.

I use an electric heater with a remote thermostat that I bought on Amazon (link below) in my bedroom. This allows me to turn down the heat in the entire house at night and to save on gas while also meaning my bedroom isn't fucking freezing come 5am. It's a nice balance of heat and $. I use a cheap electric heater (link below), it's surprisingly quiet and will easily take the chill off the room.

All of that said, a programmable thermostat is also golden. Turn the heat down when you're at work and asleep. Also, insulate your windows (and make sure they are locked as it helps seal the frame) with plastic covering and cover door gaps with blankets or heavy door mats. All these little tricks add up.

A $200 bill is a big gas bill in my three bedroom house, but you'll have to give this a shot to decide if it saves money.

Thermostat for electric heater - https://www.amazon.com/Nashone-Temperature-Controller-Thermostat-thermostat/dp/B071NG8MZK/ref=sr_1_12?keywords=thermostat+wireless&qid=1572803946&sr=8-12

Electric heater - https://www.amazon.com/Brightown-Adjustable-Thermostat-Portable-Protection/dp/B01L1O7MPE/ref=sr_1_8?keywords=electric+heater&qid=1572804045&sr=8-8

In case you don’t see the other answer, if it is “dumb” in that it’s just a dial and a switch, turn it to the highest temperature and leave it on then plug it into a thermostat type device like https://www.amazon.com/dp/B071NG8MZK/

Why don't you just get a temp sensor like this

https://www.amazon.com/gp/aw/d/B071NG8MZK/ref=pd_aw_sim_sbs_60_3?ie=UTF8&psc=1&refRID=D7N1FY57KHJXBAQT3YZ6&dpPl=1&dpID=61GWZEHUmML

Then you could plug it in near the equipment (assuming you have a surge strip in there) and then run the fans off that with a couple set points.

Okay thank you. Ill look into the cobalt easy therm. Also is this what youre referring to for a temperature controller? https://www.amazon.com/dp/B071NG8MZK/ref=cm_sw_r_cp_apa_i_1JgbBbW9TV7R8

Or remote wireless hemostat.. Does heating or cooling. I'm using one to control a window AC. Or an Inkbird type with the probe inside the garage. There are a bunch of models and probably clones.

Here's a wireless thermostat that you could use.
https://www.amazon.com/dp/B071NG8MZK/ref=cm_sw_r_cp_apa_oao0BbYD8ZPD7

so you use a light switch with a little knob for fan speed?

get something smarter

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turns itself on/off at a certain time

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they're $25 bucks.

https://www.amazon.com/Nashone-Temperature-Controller-Thermostat-thermostat/dp/B071NG8MZK/

Nashone Wireless Temperature Controller,Electric Thermostat with Remote Control Built in Temp Sensor 3 Prong Plug LCD Display Heating Cooling Mode

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BTW - swamp coolers are little more than fans and a pump for the water.

they don't use juice like AC.

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hang a wet sheet or towel and point a desk fan at it, you'll get some cooling.