I have a working slinky loop system with a flow center. It is a McQuay unit that I believe is designed to shut down when the EWT goes below 30 degrees. When the outdoor temperature gets below 20 degrees I add heat to supplement as that seems to be the temp where it is needed. The loop is buried 6-7'. I was thinking of adding 1' of soil over the entire footprint of the slinky loop field to keep the EWT a bit higher. Is this worth the effort?