Would it be possible for a planet-wide climate be set so that the temperature even at the poles would continually stay within a narrow range between 17 and 21 degrees Celsius?
(This is approximately 62 to 69 degrees Fahrenheit.)
In this scenario, the temperature would stay within this range even at the top of the tallest mountains on that planet.
Also, this would not be a scenario where, for example, the poles have the 17-or-so degrees and the equator has 21-or-so degrees. Rather, the 17-to-21 range would be present everywhere on the planet.
In this scenario the temperature could vary between any two spots (for what-ever reason). Thus we could, at any given time have e.g. 20 degrees Celsius at a location on the north pole, while at the same time having e.g. 18 degrees Celsius at some location on the equator.
This planet should preferably support human life, if that is possible.
Under what circumstances would this kind of evenly distributed temperature be possible?