Quote Originally Posted by fsq4cw View Post
To all those suggesting a larger 2-stage HP to provide 100% heating without back-up and NOT be oversized for cooling. Yes this will work to cover the difference between a GSHP providing 95% of the seasonal heat and that last 5% - but at what cost?

A larger, more expensive HP and what else?

A larger ground loop (more drilling!), maybe a second circulating pump – there goes your monetary efficiency (longer payback), and for what, a few days a year?

It’s your money…

More CO MI$$ION for a much more expensive system.