3 ms·
If you regularly get below 0F for extended periods of time, it’s not great; you’ll need electric resistive backup (expensive per btu) or ground source (more exp
by thehappypm 4y ago
If you regularly get below 0F for extended periods of time, it’s not great; you’ll need electric resistive backup (expensive per btu) or ground source (more expensive up front but quite cheap to operate).