Daikin McQuay Horizontal 2 Stage Geothermal Heat Pump Review

Daikin McQuay has been one of the most reliable and innovative names in the geothermal heat pump manufacturing business for a very long time. When it comes to pushing the very best on the market, the Daikin McQuay WGTH-381 Horizontal 2 Stage Geothermal Heat Pump is a great product. For a geothermal heat pump, the WGTH-381 is reasonably priced, nails the energy efficiency ratings most homeowners want, and can be installed relatively easily by an HVAC professional.


  • Like a lot of Daikin McQuay geothermal heat pumps, the WGTH-381 Horizontal 2-Stage uses SmartSource technology to achieve some of the highest efficiencies of which such products are capable.

  • The WGTH-381 features an ECM fan motor with 4 field adjustable fan speeds and 5 operating mode options. This gives consumers a wide range of selections, so they can customize their air comfort experience to maximize energy efficiency or decrease the operating decibel level.

  • A Copeland K-5 Scroll Compressor is a great component, and one that forms the heart of the WGTH-381 geothermal heat pump. Plus, it’s mounted on a double isolation mechanism for improved vibration control and sound reduction.


  • To maximize your energy efficiency ratings, it is best to install a geothermal heat pump like this one on an open loop. If you have to used a closed loop installation, you will still get great energy efficiency compared to conventional systems, but you won’t get the absolute best a system like this can provide.

  • Geothermal heat pumps like the WGTH-381 are not designed for amateur installation. If you’re a DIYer, you’ll still probably need professional help to get the system running.

Bottom Line

Overall, the Daikin McQuay WGTH-381 Horizontal 2 Stage Geothermal Heat Pump can be a terrific addition to any modern home or building. If you’re upgrading from a conventional heating and air installation, you are going to experience a significant increase in your home’s annual heating and cooling costs.

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