The efficiency of small USB fans for heating and cooling - gear recommendation

Having a small USB powered or rechargeable fan is one of the best upgrades for my heating and cooling system. Having several rechargeable ones, I looked to Amazon to expand with a USB plug in fan that was on sale for under 5 bucks (4.97).  There are several factors which I did not expect, which lead me to recommend such a piece of gear.  Unfortunately, this has ballooned in price to just under 6 dollars (5.97), which is a twenty percent increase.

In most scenarios, I have a battery bank with me.  Be it tent camping, car camping, or at home there is one close.  This super light fan is much lighter than my rechargeable units, and is easy to position with the long cord and lightweight unit.

My large jackery style battery bank read 0.0 watts on low, but to 2 or 3 watts on high.  A more precise plug based monitor read the low speed fan draw at 1.0 watts.

Why is a fan important for heating?  The main reason is not just air circulation, but the fact that heating is very fuel expensive.  I have theories on this, and think that we should be heating water instead of air, but licing situations are not to where we could do that.  Heating elements usually take tons of wattage, and you need a big battery bank to run most heaters, and running for long period of time is difficult.

The best heating accessory is a rheostat for plugs to where you can dial down something from off, high, mid, and low. My experience is that low cuts wattage in about half, which really helps to make a small heater get down to the 50 or 75 watt mark, where it can be ran all night.

Cutting wattage to heaters will often give decent heat, but will cut off the fan. It is much more efficient to supplement a dialed down heater with an external fan versus one running stock.

This type of electricity efficiency could help a solar homestead use less energy, or someone who simply wanted to minimize their impact upon the world.

The fan itself impresses me, because it swivels, rotates, and just works well.  Products seem to be improving, so this item link is more for reference of an item type that I suggest, than suggesting this item is better than others.  It's not as though I don't have other fans,  or a fan is new to me.  This is an odd thing for me to recommend, but here I am writing this.

https://www.amazon.com/gp/aw/d/B0CB3Z1CXL?psc=1&ref=ppx_pop_mob_b_asin_title

In cool/cold conditions, the moving air from a fan also helps with moisture management. There is a definite comfort and well-being improvement in this, though it's hard to quantify with a thermometer.

I have a big three story house and I have been playing around with heat migration a lot. A single door has netted me huge gains, but recently a blanket hung in a stair well billowed in so fast, so deep and by its sheer amount of suction I could see how much air was moving up to the third floor. Its enough so that the third floor, while unheated by any appliance stays warm.

Since I cannot stop the heat from going up the staircases without some ugly remedies, I plan to recirculate the heat gathering up the third floor staircase and by ductwork, send it back down to the first floor. Utilizing a fan in the ductwork to drive the heat back down, because of how my house is built, this is a very easy, inexpensive option.