Frequently Asked Questions

Here are some of the most typical questions related to Geothermal Loop Fields:

Do loop fields work in Minnesota?

Loop fields work extremely well in Minnesota. They are buried far enough underground to avoid frost and freezing. And they have a small amount of food grade antifreeze for added safety.

Which type of loop field is best?

While there is some difference in performance between the various types of loop fields, there is not enough to say one is better than the other. All well designed loop fields will meet the needs of the system and perform excellently if they are well designed and installed properly. Therefore, decisions on loop field type should be made based on thermal conductivity, space and costs.

How much space is required for a horizontal loop field?

On average a horizontal loop field requires about 300’ length to install. The equipment needs space to bore down to the desired level and then come back up to install the pipe.

How much damage does a vertical loop field cause during installation?

This depends on the conditions at the time of the drilling. In a yard that is very wet, the equipment will make large ruts going to and from the drill site. The drilling itself creates a great deal of mess but the mess can be reduced with additional equipment and procedures. And the digging of the header will remove a significant amount of top soil. (Click on link to see videos of vertical installations.)

What kind of antifreeze is in the loop field?

There is a variety of antifreeze that is allowed for use in loop fields. Most have significant problems with toxicity and damage to equipment. Therefore, UMR recommends using food grade propylene glycol which is non-toxic and does not damage the equipment.