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.

BRAND----------WEBSITE----------RATING´╗┐

AMERICAN DREAM--americandreamgeothermal.com--1*

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.

EARTH LINKED---earthlinked.com-------5*

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.

ETA----------------earthtoair.com------<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.

FRIGIDAIRE--------frigidaire.net--------4* 

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.

GREAT AIRE COMFORT SYSTEM--advgeo.com--<1* 

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

HELIOTHERM------heliotherm.com----<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.

MASTERTHERM--mastertherm.eu-----<1* 

The DIRECTMASTER units offer cooling as well as heating and DHW production. The units feature durable scroll compressors and electronic expansion valves for added efficiency. Their website is not much help and does not have a stated warranty policy.

NEURA-------------neura.at------------<1* 

The NDX heat pumps are for heating only and are available in six sizes to match the home. The brand is sold in Europe but their website does not have a stated warranty policy.

NEXTHERM--------nextherm.fr----------3* 

The OPTIPACK SOL/UAE units can be installed either indoors or outdoors and are backed by a very good guarantee. The units are made and sold in France but their website is not much help.

NORDIC--------nordicghp.com---------4*

This brand is from MARITIME GEOTHERMAL LTD. The DX series are available in two stage heat only or heat/cool models. They are available as either split or packaged units and have an ECM (variable speed) blower motor for quiet and efficient operation. They are backed by a very good warranty.

NUTONE--------nutonehvac.com--------4* 

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 are also backed by a very good warranty.

OCHSNER---------ochsner.com--------<1* 

These heat pumps are made in Austria and Germany. The Combi unit includes a 110 liter stainless steel storage tank for domestic hot water.

SOFATH------------sofath.com----------1* 

This brand is a part of BDR THERMEA and is sold in Europe. The standard NATEA system is for heating only but offers cooling as an option.

SUB-TERRA ----  sub-terra.com  -------3* 

This brand offers basic units but they are only sold & installed in Oregon & southern Washington. Their website is not much help but they are backed by a very good warranty.

WESTINGHOUSE--westinghousehvac.com--4* 

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 are also backed by a very good warranty.