Direct Expansion Geothermal Ratings, A Repairman Reviews The Brands...

With our direct expansion geothermal ratings, you can cut through all the sales hype and find the best value. It truly is like taking a repairman with you while you shop. We've already performed the research, compared the brands using our service experience and ranked them for you. We have given you our top pick followed by a complete list of manufacturers and their ratings.

World's Best DX Geo Unit:

Our top pick for a DX geothermal system is the PRIME SERIES from EARTHLINKED TECHNOLOGIES. The units have two stages of operation and an intelligent monitoring system. The systems are also backed by an industry leading warranty including twenty years on the loop field.

Other Direct Expansion Geothermal Ratings

We continue our direct expansion geothermal ratings with an alphabetical list of manufacturers and reviews of their products.



These units feature a two speed scroll compressor and a variable speed blower motor. They offer domestic hot water production through a desuperheater and an electrolysis protection system. The guarantee on the systems is not as good as some of the other brands.


The CLASSIC SERIES offers a single stage system with a cabinet that is rated for either indoor or outdoor installation. The PRIME SERIES features two stages of operating and an intelligent monitoring system. The systems are also backed by an industry leading warranty including twenty years on the loop field.<1*

These units feature stainless steel cabinets for durability. Their patented GSHE loop (captor) system has an insulated liquid line for efficiency. They have a dealer locator on their website but the guarantee on the systems is not very good when compared to other brands.* 

This is one of the brands from NORTEK GLOBAL HVAC. Their EarthDirEx systems feature EEV controls and are split systems for easy flexible installation. The systems use all aluminum coils to prevent corrosion and are also backed by a very good warranty.


These systems are manufactured by ADVANCED GEOTHERMAL TECHNOLOGY. Their website is not much help and does not have a stated warranty policy.<1* 

This brand is made in Austria and features a modulating compressor for ultimate efficiency and comfort. Active cooling is an option as well as domestic hot water production. The Basic Comfort series is for heating and hot water production only.