Here air-to-air machine is now using 400W and easily maintaining +21C indoors when outdoors is +1C and humidity being >95%.
Some visible frost has accumulated but operation of the machine is stable and unchanged.
I left and upped the target temp 1C, came back few hours later and indoor temp was heading to 22.5C and machine used 1770W.
Dropped the target down 1C, no real operational change and room temp kept rising.
After an hour or so later indoor temp is near 23C and machine is using 1100W, outdoor temp being a bit above zero and humidity over 95%.
After few minutes of defrosting indoor temp meter says 22.5C and next cycle start using 960W, bit later it's 1200W.
Now indoor temp is 22C, pump is chilling and using 236W, outdoor temp is probably under zero and humidity around 90%.
Few log things.
We have 3 different m3 styles, thrown, piled and solid.
Our last piled qubes were 80EUR, first more mixed and later more pine.
Here dry piled m3 of birch is said to have 1700kWh and pine 80% of that.
Once we chopped an oak and a maple, not big.
Those were very difficult to burn, oak practically didn't burn by its own.
Maple was burning but needed a hot base.
I also had free wood once.
We collected what harvester left behind, the area was some hundred meters aside and wet.
Collected trunks were chopped with a guillotine style cutter with a claw for splitting, nice thing but can't do too thick trunks.
Putting in a bent trunk can also be a bit bad for nearby flesh.
For me chopped logs were too long so I had to still cut them afterwards, the pile was also there, in the woods, so some hauling was necessary.
Just for the sake of it I estimated how much the big pile would have been cost if sold, it was over 100EUR/m3 a long ago, at least a double now.
Most of the time was used for collecting trunks, it took many days even when tractor collected small piles to big pile, but good exercise anyway.
I'd say that free can be pretty relative.