3 ms·
AIUI, ground source heat pumps get really expensive when the ground is really hard. A reasonable proxy is “do your neighbors have basements?” If the answer is
by coredog64 6y ago
AIUI, ground source heat pumps get really expensive when the ground is really hard. A reasonable proxy is “do your neighbors have basements?” If the answer is “no”, then it’s probably because digging is more trouble than it’s worth.
- pedrocr 6y agoEfficiency is still good for air source heat pumps IIRC. They only go down to 100% at well below freezing which is probably not a problem in Hawaii. Ground source only requires a small hole though, of the kind that is done for water. I'm in a granite rich area where basements are very rare but water wells are very common and reasonable cost to drill.
- toomuchtodo 6y agoMitsubishi air source heat pumps maintain ~79% capacity at -22F (check with your local Mitsubishi diamond split dealer for deets).
- axiolite 6y ago> “do your neighbors have basements?” If the answer is “no”, then it’s probably because digging is more trouble than it’s worth. Basements are popular in cold climates because footings already need to be dug several feet down to get below the frost line. In warmer areas, basements are uncommon even if digging is easy.