Ground source heat pumps

[Sedgy40]

Ground source heat pumps are the bees knees but they are not to gentle on the pocket initialy or are they at retro fitting into your average house but air source is another more affordable option

Until it's below 0 deg then the efficiency suffers

 

[Dan]

If you want to know about how to use solar thermal in the summer to reheat the ground / use it as a heat bank go here: Charging the Earth - Solar!
Everything you needed to know is there.

Wow that's awesome!