I have lived in my current house since 2012, the first 5 years in winter I used to walk into a 30F° cold shop and quickly heat it with whatever heater I had available, from Kerosene to radiant ,infrared, etc. all my tools were to cold to touch, my mill was making strange noise at the start up, I also had to deal with the moisture on cold surfaces.
5 years ago I bought a 220V electric garage heater and set the thermostat on it on low just enough to keep the temperature around 50F, 24/7. the difference in shop was huge.
It does cost to do do something like what I've done but the cost is not that high,~$30 a month extra but when I walk in my shop it is comfortable and I can start working right away, of course as soon as I walk in I increase the temp. but it is easier to go from 50F up 5 degrees than heating from30F. to 55F.